Paul takes a natural number n and adds together the distinct factors of n other than n itself. Which of these numbers can never be Paul's answer.
A. 1 B. 3 C. 5 D. 7 E. 9
(I saw this problem in a maths challenge exam and I assume that distinct factors mean all factors including 1 and n)

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1 because it doesn't have any factors other than itself and 3, 5, 7 because they're prime.

if you want a guess i will guess 9

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