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Question

Among the following, spot a pair of twin prime :

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

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.

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