10. Express each of the following numbers as the sum of three odd primes:
(a) 21          (b) 31          (c) 53          (d) 61

Answers (1)

(a) 21 = 3 + 7 + 11

(b) 31 = 5 + 7 + 19

(c) 53 = 3 + 19 + 31

(d) 61 = 11 + 19 + 31

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