Give three pairs of prime numbers whose difference is 2.

[Remark: Two prime numbers whose difference is 2 are called twin primes].

The three pairs of prime numbers whose difference is 2 are

3 and 5 (3 and 5 are prime numbers and the difference between them is 2)

5 and 7 (5 and 7 are prime numbers and the difference between them is 2)

11 and 13 (11 and 13 are prime numbers and the difference between them is 2)