7. Give three pairs of prime numbers whose difference is 2.
[Remark : Two prime numbers whose difference is 2 are called twin primes].
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Answer:Prime numbers are the numbers with two factors, 1 and the number itself. A pair of prime numbers whose difference is 2, is called twin prime. The alternative names, given to twin primes are prime twin or prime pair.
The three pairs of twin primes are as follows:
(5, 7), (11, 13), (17, 19)
The difference between these prime numbers is two.
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