CO-PRIME & TWIN PRIME

1. Which of the following is a pair of co-primes ?

• 9 and 12

• 18 and 35

• 28 and 77

1. Which of the following is a pair of twin prime ?

• 19 and 23

• 11 and 17

• 5 and 7

prime factorisation of 120

• 2 x 2 x 2 x 3 x 5

• 2 x 3 x 5 x 7

• 2 x 4 x 3 x 5

The smallest factor of 18 is _________________

• 3

• 6

• 2

• 9

Which of the following is a pair of co-primes ?

• 18 and 20

• 26 and 28

• 23 and 25

• 21 and 24

The smallest prime number after 40 is _______

• 43

• 42

• 41

• 47