Problem Solving

试题详情

题目:

If S is the sum of all the integers from 1 to 30, inclusive, what is the greatest prime factor of S ?

选项:

A、3
B、5
C、29
D、31
E、37

答案:

D

提问:

老师请问图片上这道题怎么做?[img=/resource/2017-11/667-1510833227.png]
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