求助prep ds 194

lxw19 · 发表于 2010-3-31 14:06:44

194.18755-!-item-!-187;#058&012205

If r is the remainder when the positive integer n is divided by 7, what is the value of r ?

(1)When n is divided by 21, the remainder is an odd number.

(2)When n is divided by 28, the remainder is 3.

谢谢大家~~选C，关于遇到这样的余数的题，怎样分析呢？

MortalDeity · 发表于 2010-4-1 20:32:56

我怎么觉得是选B呢

lxw19 · 发表于 2010-4-1 20:51:57

我怎么觉得是选B呢

-- by 会员 MortalDeity (2010/4/1 20:32:56)

呵呵，是选B，我打错了~~

jetball · 发表于 2011-12-17 15:17:00

碰到这种题完全没思路的路过

求助prep ds 194

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