The difference between two successive odd numbers is

(a)

1

(b)

2

(c)

3

(d)

0

The only even prime number is

(a)

4

(b)

6

(c)

2

(d)

0

Which of the following numbers is not a prime?

(a)

53

(b)

92

(c)

97

(d)

71

The factors of a number are 1, 2, 4, 5, 8, 10, 16, 20, 40 and 80. What is the number?

(a)

80

(b)

100

(c)

128

(d)

160

The prime factorisation of 60 is 2 \(\times\) 2 \(\times\) 3 \(\times\) 5. Any other number which has the same prime factorisation as 60 is

(a)

30

(b)

120

(c)

90

(d)

impossible