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Numbers - General Aptitude

Q1:

The smallest 3 digit prime number is:

A 101

B 103

C 109

D 113

ANS:A - 101

The smallest 3-digit number is 100, which is divisible by 2.  100 is not a prime number. 101 < 11 and 101 is not divisible by any of the prime numbers 2, 3, 5, 7, 11. 101 is a prime number. Hence 101 is the smallest 3-digit prime number.