[讨论]请教nn们GWD数学~~

aruora · 发表于 2009-8-26 09:04:00

数据充分题（选项省略）



A school administrator will assign each student in a group of n
students to one of m classrooms. If 3 < m < 13 < n, is it
possible to assign each of the n students to one of the m classrooms so
that each classroom has the same number of students assigned to it?



(1) It is possible to assign each of 3n students to one of m classrooms
so that each classroom has the same number of students assigned to it.

(2) It it possible to assign each of 13n students to one of the m
classrooms so that each classroom has the same number of students
assigned to it.



正确答案是B，也就是第二个条件足够充分。



我对这道题不是很有思路。想问nn们，是否可以理解成，求n/m是否能整除？而两个条件则分别理解为，3n/m 和13n/m 都可以整除？

具体思路到底该是怎样的呢？



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If n is the greatest positive integer for which 2^n is a factor of 10!, then n =



A. 2

B. 4

C. 6

D. 8

E. 10



正确答案是D。

我算的是3，答案里没有。思路是这样的，10！ = 10 * 9 * 8*....*1

n是最大的整数且2^n是10！的因子，只有8符合，那么n就是3



这个思路不对么？



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Jonana bought only $0.15 stamps and $0.29 stamps. How many $0.15 stamps did she buy?



(1) She bought $4.40 worth of stamps

(2) She bought an equal number of $0.15 and $0.29 stamps.



我选的是C；正确答案是A

后来回想，以前nn们也说过，很多GMAT题又隐含条件，比如这题就是邮票的张数只能是整数，

我想问，是不是以后碰到这种题都要先凑数，看能不能解啊？这样岂不是很麻烦？？



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A certain right triangle has sides of length x, y and z, where x < y
< z. If the area of this triangular region is 1, which of the
following indicates all of the possible values of y?



A. y > 根号2

B. (根号3) / 2 < y < 根号2

C. （根号2）/ 3 < y <  (根号3) / 2

D.  (根号3) / 4 < y < （根号2）/ 3

E. y <  (根号3) / 4

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[讨论]请教nn们GWD数学~~

[讨论]请教nn们GWD数学~~

所属分类: GMAT考试

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