Re: [計量] 機經
※ 引述《pit868 (鈞)》之銘言：
: 1.There are 5 green balls, 3 black balls and 2 red balls in a box. If 2 balls
: are taken from it without replacement what is the probability that the
: selected balls are red?
第一次拿的時候10顆裡面有2顆紅 所以有2/10機率拿紅
第二次拿的時候9顆裡面有1顆紅 所以有1/9機率拿紅
同時發生機率就是連拿2紅的機率
2/10 * 1/9 = 1/45
: 2.If 'N' is the number of two digit numbers that are not the divisible by 7 and
: 5, then the value of n is?
: A. 61
: B. 83
: C. 75
: D. 56
: 3.A person went to market with a red and a green bag and bought 10 carrots & 6
: radishes. On the way to home he distributed vegetables into the two bags in
: such a way that no bag is empty. In how many ways can he do this?
: Answer:150
這題前面有出現過囉 爬文一下~~
前幾天而已
: 我排列組合超爛
: 懇請板上各位幫我解答
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※ 編輯: bubbb 來自: 198.172.210.48 (08/31 00:07)
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