Re: [計量] Two six-sided dice are fair in the s …

看板GRE (GRE入學考試)作者fool (........)時間17年前 (2009/04/25 02:41)推噓1(1推 0噓 2→)

留言3則, 2人參與討論串1/2 (看更多)

※ 引述《sakuratea (櫻花茶)》之銘言： : 1. : Column A: The reciprocal of (1/2 + 1/3) : Column B: 根號2 : ANS: A : reciprocal不是倒數嗎?? : 因此columnA 答案應是1.2 : 就會比column B的1.414小阿... : 為啥答案還是A>B @@ : 2. : Two six-sided dice are fair in the sense that each face is equally likely to : turn up. However, one of the dice has the 4 replaced by 3 and the other die : has the 3 replaced by 4. When these dice are rolled, what is the probability : that the sum is an odd number? : A) 1/3 : B) 4/9 : C) 1/2 : D) 5/9 : E) 11/18 : ANS: D : 有請神人解惑了>"< 兩個骰子的數字分別為 123356 124456 各取一個和為奇數的機率 4 4 2 2 C1 x C1 + C1 x C1 4x4+2x2 5 ------------------------ = ----------- = ---- 6 6 6x6 9 C1 x C1 : 3. : Two people invested equal amounts of money for one year, one at 8 percent : simple annual interest and the other at 12 percent simple annual interest. If : after the one year the amounts of money invested plus interest differed by : $50, what was the original amount invested by each person? : A) $200 : B) $250 : C) $1250 : D) $1350 : E) $1400 : 我自己算是C : 設原數X元 : X(1+12%*1)-X(1+8%*1)=50 : 請問我是哪裡設錯了呢?? : ANS: B : 4. : If an employee deposited $2000 in a new credit union account and made a : single $200 deposit during each month thereafter, after how many deposits : will the employee have deposited a total of $10000 in the credit union : account? : A) 50 : B) 41 : C) 40 : D) 5 : E) 4 : ANS: B : 我算C... : 我是哪裡忽略咧????? : 我的算式如下： : 2000+200X=10000 : X=40 從第二個月開始每月存200，還要加上第一個月，應該是這樣吧 XD : 諸多問題... : 請大家熱心解答... : 感激不盡>"< -- -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 219.85.82.165