Express $21$ as the sum of three primes?

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Solution

Expressing $21$ as the sum of three primes:
Prime Numbers: The numbers which have only two factors $1$ and the number itself are called Prime Numbers.
Since, $21 = 13 + 5 + 3$
or $21 = 11 + 7 + 3$
So, $21$ can be expressed as sum of $13, 5$ and $3$ or $11, 3$ and $7$

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Question 10 (a)

Express the given number as the sum of three odd primes:
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