Re: [計量] GWD 23-16 和 GWD 23-25
※ 引述《PINKENVI (勿忘初衷)》之銘言：
: Q16:
: If k is a positive integer, what is the remainder when 2^k is divided by 10 ?
: (1) k is divisible by 10.
: (2) k is divisible by 4.
: Answer: B
: 這題我不太知道怎麼算!
(1) 10的因數為2跟5，k是十的奇數倍時餘數為4，是偶數倍時為6，無法確定。
(2) 4的因數為2，k不管是4的奇數或偶數倍，餘數都必為6。
: Q25:
: Of the high school students who participated in a recent survey,
: 110 had taken a course in biology and 230 had taken a course in history.
: How many students participated in the survey?
: (1)Of the students who participated in the survey, 120 had taken neither a course in biology nor a course in history.
: (2)Of the students who participated in the survey, 60 had taken both a course in biology and a course in history.
: Answer:C
: 這題為啥是C阿!如果已經個別知道biology和history的人數!又只要知道他們重複的人數!
: 那不就是用P(AUB)=P(A)+P(B)-P(A交集B)就可算出嘛?
: 我不懂為啥還要用到(1)?
: 嗯 謝謝回答! :)
因為不是給你機率，是給你實際人數。
第一題你稍微算一下就知道
第二題你是被混淆了^^
應該是這樣沒錯吧^^
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◆ From: 125.225.155.14
※ 編輯: windton 來自: 125.225.155.14 (12/17 19:01)
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