The sum of the first four primes is (a) 10         (b) 11         (c) 16       (d) 17

Sum of the first four positive prime numbers

The average of the first nine prime numbers is (a) 9 (b) 11 (c) 11(1)/(9) (d) 11(2)/(9)

Which of the following numbers are twin primes? (a) 3, 5 (b) 5, 11 (c) 3, 11 (d) 13, 17

The median of first 10 prime numbers is (a) 11 (b) 12 (c) 13 (d) 14

The median of first 10 prime numbers is (a) 11 (b) 12 (c) 13 (d) 14

Which of the following are not twin-primes? (a) 3, 5 (b) 5, 7 (c) 11, 13 (d) 17, 23

The mean of a data is 15 and the sum of the observations is 195. The number of observations is (a) 13 (b) 19 (c) 16 (d) 17

Which of the following numbers are twin primes? 3,5 (b) 5,11 (c) 3,11 (d) 13,17

The sum of the exponents of the prime factors in the prime factorisation of 196, is (a) 1 (b) 2 (c) 4 (d) 6