考前求助，急，数学，谢谢各位大牛了

zhanglin222 · 发表于 2012-4-11 12:13:22

今天做了prep，有道数学题怎么想都不通，求助各位大牛！！！要考了！！！

Did one of 3 members of a certain team sell at least 2 raffle tickets yesterday?

(1) The 3 member sold a total of 6 raffle tickets yesterday.
(2) No 2 of the members sold the same number of raffle tickets yesterday.

为啥答案给的是D啊，第二个条件怎么能充分呢。。。

fofook · 发表于 2012-4-11 12:18:03

No 2 of member sell the same, 是说没有2个人卖得一样
所以最少的情况是， 0，1，2

zhanglin222 · 发表于 2012-4-11 12:28:13

原来如此，谢谢啦！！再问大牛两道题：
For every positive even integer n, the function h(n) is defined to be the product of all the even integer from 2 to n, inclusive. If p is the smallest prime factor of h(100)+1, then p is

A between 2 and 10
B between 10 and 20
C between 20 and 30
D between 30 and 40
E greater than 40
为啥选E？完全没思路

2. Is m+z>0?

(1) m-3z>0
(2) 4z-m>0
为啥是C啊，m>-z就是充分的了，A不是就行了吗？

fofook · 发表于 2012-4-11 12:41:04

1, h(100)+1=2>50x1x2x....x50+1, 所以除任何数都会余1
＞是次方的意思

2，第一个， m=1, z=-2
第二种， m=-100, z=2
合起来， 3z<m<4z, 说明m z 都大于0

考前求助，急，数学，谢谢各位大牛了

所属分类: GMAT考试

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