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标题: ff 5-5 感觉答案不对, 请指教 [打印本页]

作者: smallkiddy    时间: 2006-2-5 07:37     标题: ff 5-5 感觉答案不对, 请指教

5、从1-100中任意选7个数,问它们分别除以7后所得的余数的和是否是7的倍数?

1)这7个数的range6

2)这7个数consecutive

【答案】D

【思路】

1)这7个数的RANGE6, for example, 如果确定最小的数为3, 由于RANGE6,可以得出最大数为9,therefore,其实也就是7个连续的

Range does not mean consecutive numbers. They could be '3 3 3 3 3 3 9' and these # has range of 6 also, but their

sum is not divisible by 7.

盼望 nn 解答


作者: bobiouou    时间: 2006-2-5 19:35

从1到100里任意选择7个数,隐含了不可以重复的条件。






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