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

Rank: 6 Rank: 6

3^#

seinfeld0923发表于 2008-2-15 19:09 | 只看该作者

thanks !!

Rank: 4

2^#

XIAOXIANGXI发表于 2008-2-11 20:34 | 只看该作者

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)

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