Answer:
(a) We have, 21 \[\Rightarrow \] 21 = 3 + 5 + 13 where 3, 5 and 13 are odd prime numbers. (b) We have, 31 \[\Rightarrow \] 31 = 3 + 5 + 23 where 3, 5 and 23 are odd prime numbers. (c) We have, 53 \[\Rightarrow \] 53 = 13 + 17 + 23 where 13, 17 and 23 are odd prime numbers. (d) We have, 61 \[\Rightarrow \] 61 = 7 + 13 + 41 where 7, 13 and 41 are odd prime numbers.
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