Q1: Which one of the following is a prime number ?
A 161
B 437
C None of these
D 221
E 373
ANS:C - 373
437 > 22
All prime numbers less than 22 are : 2, 3, 5, 7, 11, 13, 17, 19.
161 is divisible by 7, and 221 is divisible by 13.
373 is not divisible by any of the above prime numbers.
373 is prime.
373 is prime.