Answer:
Prime numbers less than 20 are 2, 3, 5, 7, 11, 13, 17 and 19. Here, 2 + 3 = 5 (divisible by 5); 2 + 13 = 15 (divisible by 5) 3 + 7 = 10 (divisible by 5); 3 + 17 = 20 (divisible by 5) 7 + 13 = 20 (divisible by 5) Hence, five pairs of prime numbers whose sum is divisible by 5 are (i) 2, 3 (ii) 2, 13 (iii) 3, 7 (iv) 3, 17 (v) 7, 13
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