即将裸考~请教prep数学～～

FairyFox

26号就要杀G了。。。麻烦各位教教我prep这几道题～～

1.For every positive even integer n , the function h(n) is defined  to be the product of all the even integers 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   （为什么是这个啊）

2.DS题

If $1,000 is deposited in a certain bank account and remains in the account with any accumulated interest , the dollar amount of interset I , earned by the deposit in the first n years in given by the formula I=1,000【（1+r/100)^n - 1】， where r percent is the annual interest rate paid by the bank , Is the annual interest rate paid by the bank greater than 8 percent ?

(1). The deposit earns a total of $210 interest in the first two years .

(2). （1+r/100)^2 > 1.15  （这个为什么不行啊？）

3.也是DS题

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

(1). The 3 members sold a total of 6 raffle tickets yesterday.

(2).No 2 of the members sold the same number of raffle tickets yesterday.

为什么这里两个都行啊？

谢哦谢哦～～

FairyFox

这样的啊～～谢谢两位啊～～谢哦谢哦～～

FairyFox

第2题，我还是不懂。。。

如果条件2能给出NO的答案，应该是充分的啊，DS题不是指的是，不确定的情况下条件才不充分才要排除的么？如果回答问题的话，不论是YES/NO， 条件都是充分的啊。不是这样的么？

FairyFox

我太笨了。。。谢谢啊～～茅塞顿开～～