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Question Write three pairs of prime numbers less than 20 whose sum is a multiple of 5.
The pairs of prime numbers less than 20 whose sum is a multiple of 5 are as follows:
(2, 3) as 2 + 3 = 5 which is a multiple of 5.
(3, 7) as 3 + 7 = 10 which is a multiple of 5.
(2, 13) as 2 + 13 = 15 which is a multiple of 5.
(7, 13) as 7 + 13 = 20 which is a multiple of 5.
(3, 17) as 3 + 17 = 20 which is a multiple of 5.
(Answer may vary)