Write all the factors of the following numbers: 21
We need to express the given numbers as the sum of odd primes. The prime numbers between 1 and 50 are listed below: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47. So using the above any three odd primes we need to express as the sum of the given number. (a) 21 = 3 + 7 + 11
