Problem Solving

试题详情

题目:

Rita and Sam play the following game with n sticks on a table. Each must remove 1, 2, 3, 4 or 5 sticks at a time on alternate turns, and no stick that is removed is put back on the table. The one who removes the last stick (or sticks) from the table wins. If Rita goes first, which of the following is a value of n such that Sam can always win no matter how Rita plays?

选项:

A、7
B、10
C、11
D、12
E、16

答案:

D

提问:

请May老师解答一下,谢谢
评分: 0
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提问:

看到这个题没有任何思路...老师可以讲一下思路吗?感觉跟余数有关
评分: 4
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