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range为6;
(2)这7个数consecutive;
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【答案】D
【思路】
(1)这7个数的RANGE为6, for example, 如果确定最小的数为3, 由于RANGE为6,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.
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