Question

Among the following, spot a pair of twin prime :

• A. (15,17)
• B. (7,11)
• C. (19,21)
• D. (59,61)

Answer 1

The correct option is D (59,61)

A twin prime is a pair of prime number that is either 2 less or 2 more than the other prime number. Here both (15,17) and (19,21) differ by 2, but 15 and 21 are not primes. In the case of 7 and 11, even though they are primes their difference is not two. Hence the answer is (59,61) in which, both are both are prime numbers which differ by 2.