Prep旧DS 2- 194

terry_run

194.
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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.

深夜做题 脑子发昏 。。求同学指点

[此贴子已经被作者于2009/8/4 1:37:00编辑过]