The difference between two successive odd numbers is

(a)

1

(b)

2

(c)

3

(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

If the number 6354 * 97 is divisible by 9, then the value * is

(a)

2

(b)

4

(c)

6

(d)

7

The number 87846 is divisible by

(a)

2 only

(b)

3 only

(c)

11 only

(d)

all of these

Which of the following pairs is co-prime?

(a)

51, 63

(b)

52, 91

(c)

71, 81

(d)

81, 99

The greatest 4 digit number which is exactly divisible by 8, 9 and 12 is

(a)

9999

(b)

9996

(c)

9696

(d)

9936

The HCF of two numbers is 2 and their LCM is 154. If the difference between the numbers is 8, then the sum is

(a)

26

(b)

36

(c)

46

(d)

56

Which of the following cannot be the HCF of two numbers whose LCM is 120?

(a)

60

(b)

40

(c)

80

(d)

30