prep的几道题目

clairette · 发表于 2009-11-17 14:33:08

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1.If n and m are positive integers,what is the remainder when 3^(4n + 2 + m) is divided by 10 ?

(1) n = 2

(2) m = 1

答案是B

3^4n+3 当n取奇数 3^7 3^15 3^23 ……都除以4 可以发现余数都为3 所以原式以7结尾除以10 余数都为 7 （因为3^n 以 3 9 7 1 循环）

可是当 n 取偶数，3^11 3^19 3^27 都除以4，余数不确定呀！原式也无法确定以哪个数字结尾

为什么还选B啊？求助！！！

MonkeyDeLuff · 发表于 2009-11-17 14:39:50

思路有问题啊余数应该是7 总是7×1 如果m=1的话

prep的几道题目

所属分类: GMAT考试

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