Problem Solving

试题详情

题目:

If n = 20! + 17, then n is divisible by which of the following?
  1. 15
  2. 17
  3. 19

选项:

A、None
B、I only
C、II only
D、I and II
E、II and III

答案:

C

提问:

解题思路是什么?为什么加上17后一定可以整除17
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