Re: [數學]請教!!
※ 引述《OdysseyGRE (Odyssey)》之銘言：
: 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應該是紅髮的機率除以非棕髮的機率的答案
(20/100)/(45/100)
你題目有沒有給錯^^"
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 61.216.100.161
推
08/01 22:40, , 1F
08/01 22:40, 1F
討論串 (同標題文章)
GRE 近期熱門文章
PTT職涯區 即時熱門文章
