提问！回答！

sxcream

Q9:

If an integer n is to be chosen at random from the integers 1 to 96, inclusive, what is the probability that n(n + 1)(n + 2) will be divisible by 8?

 

A.     1/4

B.     3/8

C.     1/2

D.     5/8

E.      3/4

答案是D。虽然做对了，但是用的方法不是很简便，请高人帮我指点迷津！

Q16:

What is the probability that a student randomly selected from a class of 60 students will be a male who has brown hair?

(1)     One-half of the students have brown hair.

(2)     One-third of the students are males.

这道题目我做的也是对的，答案是E。但是不知道我的思路有没有问题。我是这么想的：BROWN HAIR的是30个人，MALE是20个人。20个人有可能是完全独立于BROWN HAIR的30个人之外的，也就是也有可能BROWN hair的都是女生。

Q29:

The annual rent collected by a corporation from a certain building was x percent more in 1998 than in 1997 and y percent less in 1999 than in 1998.  Was the annual rent collected by the corporation from the building more in 1999 than in 1997?

(1)     x > y   

(2)      xy/100< x – y

像这样子抽象的题目我就搞不清楚了。。。

暂时求教这么多。发现自己做数学的时候还是太大意了。很多题目没看清楚题干就解题了。哎，马上就要上战场了，应该要调整好心态。为自己，为战友们加油！

sxcream

自己给自己顶一下。以往这个时候都有很多NN的回复了。今天咋了。。。

sxcream

谢谢楼上各位！！！