Re: [計量] 求一題 GWD數學感謝
※ 引述《greatgun (槍王)》之銘言：
: 第八回
: Q9:
: If an integer n is to be chosen at random from the integers 1 to 96,
: , inclusive, what is the probability that n(n + 1)(n + 2)
: will be divisible by 8?
: 小弟數學不怎好我怎麼算都是 1/2 可是答案都不是這個 麻煩會的人一下 感謝!ANS: 5/8
首先總共96組
偶數開頭 (因為一定有2和4的倍數) 48組
奇數開頭 中間夾著8的也 也算進來 12組
所以 (48+12)/96 = 5/8
: Q13:
: Company S produces two kinds of stereos: basic and deluxe. Of the stereos
: produced by Company S last month, 2/3 were basic and the rest were deluxe.
: If it takes 5/7 as many hours to produce a deluxe stereo as it does to
: produce a basic stereo ,then the number of hours it took to produce the deluxe
: stereos last month was what fraction of the total number of hours it took to
: produce all the stereos?
: 我算出來是1/3 可是答案也是錯的 不知道是不是我理解有問題 感謝 ANS:7/17
首先算 deluxe 和 basic 的製造時間比 = 7/5 : 1 = 7 : 5
產量乘以時間=
(7*1/3)/(7*1/3 + 5*2/3) = 7/17
參考一下吧~
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