Re: [計量] A bowl contains red, green, ...
※ 引述《Hide0916 (紅)》之銘言：
: 1. A bowl contains red, green, and white balls. The probability of
: choosing a red ball is 1/3.There are 5 more green balls than red
: ones, and there are 12 white balls total. What is the odds against
: chossing a white ball?
: a.12/39 b.12/51 c.13/4 d.17/4 e.12/22
: Ans: C
: 我算出來紅、綠、白球各是 17, 22, 12 顆
: 但是我實在不懂最後一句是甚麼意思???
Google 大神說
Odds against is a ratio of the probability of A not occurring to the
probability of A occurring.
所以...你懂了
: 4. 若 1 < a < b < 2 要怎麼證明 a+b > ab 呢??
set b = a+c
a+b = a+a+c = 2a+c > 2a > a*b
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12/25 15:26, , 1F
12/25 15:26, 1F
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