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Prime and Composite Numbers

Express each ...

Question

Express each of the following as a sum of two or more primes?

(i) 13
(ii) 130
(iii) 180

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Solution

We can write the given numbers as the sums of two or more primes as follows:

(i) 13 = 11 + 2

(ii) 130 = 59 + 71

(iii) 180 = 139 + 17 + 11 + 13 or 79 + 101

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