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(1)

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(2)

Questions 1 to 10, 3 marks each

1.

The value of 2010 − 20.10 is

(A) 1990.09

(B) 1990.9

(C) 1989.09

(D) 1989.9

(E) 1998.9

2.

If m = 3 and n = −

3

5

, then

m

n

equals

(A) −5

(B) 5

(C) −

9

5

(D) −

5

3

(E) 15

3.

The midpoint of P Q is M (−4, 6). The point Q has coordinates (10, 12). The point

P is

(A) (−18, 0)

(B) (−18, 18)

(C) (−10, 0)

(D) (3,9)

(E) (3,18)

4.

The number 63 is 87.5% of which number?

(A) 45

(B) 70

(C) 72

(D) 74

(E) 75

5.

What percentage of the largest square is covered

by the shaded square?

(A) 6.25%

(B) 10%

(C) 12.5%

(D) 16%

(E) 25%

... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ...... ...... ... ...... ...... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. . ...... ... ... ... ... ... ... ... ... ... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ...... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. . ... ... ... ... ... ... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ... ... ... ... ... ... ... ... ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.

Seven scores 8, 10, 24, 28, 23, 9 and x, have the property that the mean and

median are both x. The value of x is

(3)

S 2

7.

The radius of circle P is

2

3

of the radius of circle Q and the radius of circle Q is

3

4

of the radius of circle R.

... ...... ... ...... ... ...... ...... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .... .... .... .... .... ... ... ... ... ... ... ... ... ... ... ... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ... ... ... ... ... ... ... ... .... .... .... ... ... ... ... ... ... ... ... ... ... ... ...... ......... ... ... ... ... ... ... .... .... ... ... ... ... ... ... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ... ... ... ... .... ... ... ... ... ... ... ...... ...... ...... ...... ... ... ... ... ... ... ... ... ... ... ... ... .... .... .... ... ... ... ... ... ... ... ... ... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ... ... ... ... ... ... .... .... ... ... ... ... ... ... ... ... ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

P

Q

R

What fraction of the area of the largest circle R is the shaded area?

(A)

1

3

(B)

5

9

(C)

1

4

(D)

3

16

(E)

5

16

8.

A coin is tossed five times. What is the probability that the result will not be five

tails in a row?

(A)

15

16

(B)

27

32

(C)

4

5

(D)

9

10

(E)

31

32

9.

A rectangle is divided into x rows of y identical squares. Half of them are shaded

to form the border with uniform width of 1 square as shown.

... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ... ... ... ... ... ... ... ... ... ... ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

The sum of x and y could be

(A) 17

(B) 20

(C) 18

(D) 19

(E) 16

10.

When the numbers x

3

, x

2

, x, −x and

x are arranged in order from the largest to

(4)

Questions 11 to 20, 4 marks each

11.

For all values of x, the expression

7

3x

+ 7

2x

7

2x

+ 7

x

is equal to

(A) 49

(B) 7

2x

(C) 7

(D) 7

x

(E) 1

12.

P QS is a triangle with R lying on QS, with P Q = P S = SR and

6

QRP =

6

QP S.

............ ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ...

Q

S

P

R

The size of

6

P SR, in degrees, is

(A) 30

(B) 36

(C) 45

(D) 60

(E) 70

13.

If

3a + 4b

2a − 2b

= 5, then

a

2

+ 2b

2

ab

equals

(A) 1

(B) 2

(C) 3

(D) 4

(E) 5

14.

The value of (123456785) × (123456782) − (123456783) × (123456784) is

(A) −2

(B) −1

(C) 0

(D) 1

(E) none of these

15.

The length of each side of a triangle like the one below is a different prime number

and its perimeter is also a prime number.

... .

What is the smallest possible perimeter of such a triangle?

(5)

S 4

16.

The 5-digit number a986b, where a is the first digit and b is the units digit, is

divisible by 72. What is the value of a + b?

(A) 9

(B) 10

(C) 12

(D) 13

(E) 15

17.

A cap consists of six pieces, all the same size and shape.

... ...... ... ...... ...... ... ... ... ... ... ... ... ... ... .... .... .... ... ... ... ... ... ... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ... ... ... ... ... ... .... .... ... ... ... ... ...

... ... ... ...... ...... ...... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ... ... ... ... ... ... ... ... ... ... ... ... .... .... .... .... ... ... ... ... ... ... ... ... ... ... ... ...... ...... ...... ...... ...... ...

If each piece can be either gold or brown, how many different caps can be made?

(A) 12

(B) 14

(C) 16

(D) 18

(E) 20

18.

For all positive integers n, Snap(n) = 2n if n is even and Snap(n) = 3n if n is odd.

If p is a prime number greater than 2, what is the value of Snap

Snap(p − 1) − p

¥

?

(A) p − 2

(B) 2p − 2

(C) 2(p − 2)

(D) 3p − 2

(E) 3(p − 2)

19.

A circle is inscribed in a quadrant of a larger circle. The

ratio of the area of the inner circle to that of the quadrant

is

(A) 2 : 3

(B) 4 : 5

(C) 3 : (2 +

3)

(D)

2 :

3

(E) 4 : (3 + 2

2)

.. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ... ... ... ... ... ... ... .... .... ... ... ... ... ... ... ... ... ...... ... ...... ... ...... ......... ... ... ... ... ... ... ... ... ... ... ... ... .... .... .... ... ... ... ... ... ... ... ... ... ... ... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. . ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .... .... ... ... ... ... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ... ... ... .... ... ... ... ... ...... ......

20.

The operation

N

means a

N

b = a + b

2

. If a > 0 and (a

N

a)

N

a = a

N

(a

N

a),

then a equals

(6)

Questions 21 to 25, 5 marks each

21.

The super factorial number 1! × 2! × 3! × · · · × 12! can be written as a factorial

times a perfect square, that is, in the form m! × n

2

. What is the value of m?

(A) 4

(B) 6

(C) 8

(D) 10

(E) 12

22.

The rectangular piece of paper pictured has length AB = 24 cm and width

AD = 10 cm. It is folded along the diagonal AC and then triangle ACD is folded

along the line AE so that AD is aligned with AC.

... ... ... ... ... ... ... ... ... ... ... ... ... ... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ... ... ... ... ... ... ... ... ... ... . ... ... ... ... ...

... ...... ...... ...... ...... ...

A

B

D

C

10 cm

24 cm

=⇒

...... ...... ...... ... ... ... ... ... ... ... ... ... ... ... ... .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. . ... ... ... ...... ...... ...... ...... ...... ...... ... ... ... .... ... ... ... ... .

... ...

A

B

D

C

E

=⇒

...... ...... ...... ... ... ... ... ... ... ... ... ... ... ... ... .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. . ...... ...... ...... ...... ...... ... ... ...... ... ... ... ...

A

B

D

C

E

=⇒

... ... ... ... ... ... ... ... ... ... ... ... ... ... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ... ... ... ... ... ... ... ... ... ...... ...... ...... ...... ... ...... ...... ...... ...... ....

A

B

D

E

C

How long, in centimetres, is DE?

(A)

13

2

(B)

10

3

(C)

20

3

(D) 8

(E) 12

23.

There are sixteen different ways of writing four-digit strings using 1s and 0s. Three

of these strings are 1010, 0100 and 1001. These three can be found as substrings

of 101001. There is a string of nineteen 1s and 0s which contains all sixteen strings

of length 4 exactly once. If this string starts with 1111, the last four digits are

(A) 1110

(B) 0000

(C) 0110

(D) 1010

(E) 0111

24.

What is the smallest n such that no matter how n points are placed inside or on

the surface of a cube of side length 16 units, there are at least two of these points

which are closer than 14 units to each other?

(7)

S 6

25.

Loki stands at the centre of a forest which has trees with trunks of identical radii

at every integer coordinate point except the origin, where he is standing. From

where he is, he cannot see beyond the second tree in any direction. That is, he

cannot see any tree with either coordinate of magnitude greater than 2. What is

the smallest possible radius of the tree trunks?

(A)

1

2

(B)

1

3

(C)

1

10

(D)

1

13

(E)

1

2(

13 − 3)

For questions 26 to 30, shade the answer as an integer from 0 to 999 in

the space provided on the answer sheet.

Question 26 is 6 marks, question 27 is 7 marks, question 28 is 8 marks,

question 29 is 9 marks and question 30 is 10 marks.

26.

If m + n = 11 and m

2

+ n

2

= 99, what is the value of m

3

+ n

3

?

27.

A 3-digit number is subtracted from a 4-digit number and the result is a 3-digit

number.

=

The 10 digits are all different.

What is the smallest possible result?

28.

In the triangle P QR, P Q = P R = 40 cm and S is a point on QR such that

P S = 25 cm. The extension of P S meets the circle through P QR at T .

... ...... ... ...... ...... ...... ... ... ... ... ... ... ... ... ... ... ... ... ... .... .... .... ... ... ... ... ... ... ... ... ... ... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ... ... ... ... ... ... ... .... .... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ...... ...... ...... ...... ... ... ... ... ... ... ... ... ... ... ...

Q

P

R

S

T

What is the length, in centimetres, of P T ?

(8)

non-30.

There are many towns on the island of Tetra, all connected by roads. Each town

has three roads leading to three other different towns: one red road, one yellow

road and one blue road, where no two roads meet other than at towns. If you

start from any town and travel along red and yellow roads alternately (RYRY...)

you will get back to your starting town after having travelled over six different

roads. In fact RYRYRY will always get you back to where you started. In the

same way, going along yellow and blue roads alternately will always get you back

to the starting point after travelling along six different roads (YBYBYB). On the

other hand, going along red and blue roads alternately will always get you back to

the starting point after travelling along four different roads (RBRB). How many

towns are there on Tetra?

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