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Question

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

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Solution

(a)21=3+5+13 where 3,5,13 are odd as well as prime.

(b)31=3+5+23 where 3,5,23 are odd as well as prime.

(c)53=3+7+43 where 3,7,43 are odd as well as prime.

(d)61=3+5+53 where 3,5,53 are odd as well as prime.

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