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3 February, 15:21

A = 13+26+39 + ... + 169

What is the sum of the prime numbers that can divide A?

A) 16 B) 18 C) 20 D) 22 E) 24

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  1. 3 February, 19:19
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    A = 13+26+39 + ... + 169=

    = 13 (1+2+3 + ... + 13) =

    =13 * (13*14) / 2=

    =13*13*7

    => 13+7=20

    So the answer is c)
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