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标题: gwd-1--4 [打印本页]

作者: equilibrium    时间: 2005-6-2 06:08     标题: gwd-1--4

Q4:

If n is the product of the integers from1 to 20 inclusive, what is the greatest integer k for

which 2k is a factor of n?

A. 10

B. 12

C. 15

D. 18

E. 20

Answer:


作者: nbnhjf    时间: 2005-6-2 06:12

1*2*3*4*5。。。。*20

我是笨方法把含有2因子个数一个个加的

2,4,6,8,10,12,14,16,18,20=

1+2+1+3+1+2+1+4+1+2=18






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