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Give three pairs of prime numbers whose...

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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`Solution`: Three pairs of prime numbers whose difference is 2 are `(5, 7)`, `(11, 13)` and `(17, 19)`.
Here is explanation:
Three pairs of prime numbers whose difference is `2` are:
a) `5, 7`
...
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