Re: [計量] 三題問題請教
※ 引述《aicwebb (peter)》之銘言：
: 1. COL A: The number of ways to exchange a $100 bills for
: $5,$10 or $50.
: COL B: 17
: ANSWER: A
all $5
all $10
all $50
10 10 10 10 10 10 10 10 10 10 *9(有9個$10可以用$5代替)
10 10 10 10 10 50*5(有5個$10可以用$5代替)
1+1+1+9+5=17
: 2. How many possible committees can be formed from a group of seven
: people if each committee can have any number of members from one to seven?
: ANSWER: 127
C7取1+C7取2+C7取3+C7取4+C7取5+C7取6+C7取7=7+21+35+35+21+7+1=127
: 3. Before the start of a horse race, and based on the past performance of the
: horse entered, the spectators are told that the chances are 4 to 1 that Aegis
: will win. What is the probability that Aegis will lose?
: ANSWER: 1/5 (the chances are 4 to 1 that Aegis will win這一句話看不太懂...)
贏比輸=4:1
輸的機率=1/5
: 有哪位大大救救我嗎?? 大感謝~
有錯請鞭..qq
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