Which of the following numbers are twin primes?
(a) 3,5
(b) 5,11
(c) 3,11
(d) 13,17
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Solution
Twin primes are pairs of primes which differ by two.
In (3, 5), the difference between the two primes is 2.
Therefore, (3, 5) are twin primes.
Hence, the correct answer is option (a).