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标题: 求助一道题 [打印本页]

作者: seinfeld0923 时间: 2008-2-11 11:27 标题: 求助一道题

Q25:

If the number 52,1n9, where n represents the tens digit, is a multiple of 3, then the value of n could be which of the following?

A. 6

B. 5

C. 3

D. 1

E. 0

Answer: d

没看明白是什么意思。。请牛牛解释解释

作者: XIAOXIANGXI 时间: 2008-2-11 20:34

if 521n9 is the multiple of 3, then 5+2+1+n+9 is the multiple of 3, then n= 1, 4 , 7 (1<n<9)

作者: seinfeld0923 时间: 2008-2-15 19:09

thanks !!

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