作者Pluronics (= =)
看板GRE_Verbal
标题Re: [数学]请教!!
时间Wed Aug 1 21:29:47 2007
※ 引述《OdysseyGRE (Odyssey)》之铭言：
: 1. The "reflection" of a postive integer is obtained by
: reversing its digits. For example, 321 is the
: reflection of 123. The difference between a five-digit
: integer and its reflection must be divisible by which
: of the following?
: Ans: 9
: 2. If 55 percent of a group of people have brown hair and
: 80 percent of the same group do NOT have red hair, what
: fraction of those who do NOT have brown hair and red hair?
^^^
: Ans: 4/9
4/9应该是红发的机率除以非棕发的机率的答案
(20/100)/(45/100)
你题目有没有给错^^"
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