Numbers - General Aptitude

Q1:

How many prime numbers are less than 50 ?

A 16

B 15

C 14

D 18

ANS:B - 15

Prime numbers less than 50 are:
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47 Their number is 15