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Q.11 Write five pairs of prime numbers less than 20 whose sum is divisible by 5. (Hint: 3 + 7 = 10)


Answer :

(a) 5 = 4+ 1. (3 ,2 )
(b) 10 = 7+3 (7,3 )
(c) 15 = 9 + 6 ( 2, 13 )
(d) 20 = 17 + 3 (17,3 )
(e) 20 = 13+ 7 (13, 7)

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