请帮忙几道数学题，HELP!!

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      

                                                                                       Answer:

怎么简便的算出这个结果！

Q24:

At a certain company, each employee has a salary grade s that is at least 1 and at most 5.  Each employee receives an hourly wage p, in dollars, determined by the formula p = 9.50 + 0.25(s – 1).  An employee with a salary grade of 5 receives how many more dollars per hour than an employee with a salary grade of 1?

A.    $0.50

B.    $1.00

C.    $1.25

D.    $1.50

E.    $1.75

                                                                                        Answer：C

我算出的答案是b

Q36:

If n is an integer and 100 < n <200, what is the value of n?

(1)   n/36    is an odd integer.

(2)   n/45    is an even integer.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

                                        Answer：C

我觉得只要（2）就可以确定了啊，只有n=4*45的时候可以满足题设啊！

Q9:如果n是偶数，那么n(n+1)(n+2)一定可以被8整除，你可以拆成(n/2)[(n+2)/4](n+1)；如果n是奇数,那么只有(n+1)是8的倍数时才能被8整除。在1-96之间有96个数字，偶数48个，能取的奇数有12个（如：7、15、23...95，其实直接96/8＝12就可以了），一共就是60个数字。概率就是60/96＝5/8

Q24:题目没错的话就相信自己的答案。

Q36:原来没有看清楚，就是B。

题目是gigi13里面的。

嗯，第一道题明白了，呵呵，谢谢咯！

不过Q36中的b选项说的是n/45是偶数，如果是你说的135的话，那么n/45就是3是奇数了啊

thx again~~~

帮忙做下啊