请教PREP里的数学

janetking

这种类型的题我不怎么会做 请大家帮我解答 谢谢了
if each term in the sum a1(1是下标，后同）+a2+a3...+an is either 7 or 77 and the sum equals 350,which of the following could be equal to n?答案是40

what's the remainder when the positive integer x is devided by 6?
(1)when x is divided by 2,the remainder is 1;and when x is divided by 3,the remainder is 0.
(2)when x is divided by 12,the remainder is 3
答案是(D)

请教这样类型的方法。谢谢了。二月三号要出战了，可是数学不灵，大家为我加油啊。

janetking

有朋友回答吗？很急。。谢谢

jojo1213

下载PREP数学详解版，里面有解释。
http://forum.chasedream.com/GMAT_Math/thread-419618-1-1.html?SearchText=prep%20%CA%FD%D1%A7%20%CF%C2%D4%D8

janetking

下载PREP数学详解版，里面有解释。
http://forum.chasedream.com/GMAT_Math/thread-419618-1-1.html?SearchText=prep%20%CA%FD%D1%A7%20%CF%C2%D4%D8

-- by 会员 jojo1213 (2010/1/18 14:15:19)

谢谢