求助两道PREP数学题！

mumuinter

搜了一下没看到讨论这个的帖子也不知道从什么资料里找还是直接来请教大牛们了_(:з」∠)_
第一题：
According to the directions on a can of frozen orange juice concentrate, 1 can of concentrate is to be mixed with 3 cans of water to make orange juice. How many 12-ounce cans of the concentrate are required to prepare 2006-ounce servings of orange juice?
A 25
B 34
C 50
D 67
E 100

第二题
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

mumuinter

人工顶……或者有知道哪里有分析的小伙伴求个名字也好。。。

mumuinter

人工顶………………

lighthousecn

to prepare 200 servings of 6-ounce orange juice？
A 25


E>40

mumuinter

lighthousecn 发表于 2014-12-10 16:22
to prepare 200 servings of 6-ounce orange juice？
A 25

我知道答案想知道解题思路……谢谢！

mumuinter

lighthousecn 发表于 2014-12-10 16:22
to prepare 200 servings of 6-ounce orange juice？
A 25

原来第一题是题目写错了……求第二题解题思路，谢谢

lighthousecn

第二题H（100）是好大个数2^50(50!)+1,就是1到50以内都提不出来公因子，所以公因子必大于50

mumuinter

lighthousecn 发表于 2014-12-13 09:47
第二题H（100）是好大个数2^50(50!)+1,就是1到50以内都提不出来公因子，所以公因子必大于50 ...

原来如此我还一个劲地想把P求出来……谢谢！！