Prep DS13题

ytingru · 发表于 2011-2-22 06:25:06

请教牛人一道DS的题：

Does the integer K have a factor P such that 1<

<K?
(1) K>4!
(2) 13! + 2 <= k <= 13! + 13

答案是（B）实在是百思不得其解啊，求助！

sdcar2010 · 发表于 2011-2-22 08:15:30

Under condition 2), K = 13! +2; 13! + 3; ... 13! + 13.

Let's take a look at the first choice.

K = 13! + 2 = 2 *(3*4*5..*12*13 +1) So P = 2 is a factor of K and p is bigger than 1 and smaller than K.

Likewise, all the other possible choices of condition 2 has at least one factor between 2 and 13 (inclusive).

Sufficient.

ytingru · 发表于 2011-2-23 11:43:22

Thanks a lot

Prep DS13题

Thank you so much

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