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

(a) 21= 1+ 5+ 15.
(b) 31 = 7 +9 + 15
(c) 53 = 25 + 23 +5
(d) 61 = 33 + 21 + 7