there are4 number cards in a box:2,4,5,9
peter draws 2 cards randomly from the box.find the probability that
(a)the product of the 2 numbers is odd
(b)the sum of the 2 numbers is less than ten
(c)the difference of the 2 number is even
Probability01
2009-10-14 4:33 am
回答 (2)
2009-10-14 4:43 am
✔ 最佳答案
There are 6 combinations(2,4), (2,5), (2,9), (4,5), (4,9), (5,9)
(a)the product of the 2 numbers is odd
Only (5,9) will satisfy. Probability = 1/6
(b)the sum of the 2 numbers is less than ten
(2,4), (2,5), (4,5) Probability = 3/6 = 1/2
(c)the difference of the 2 number is even
(2,4), (5,9) Probability = 2/6 = 1/3
2009-10-21 5:00 am
收錄日期: 2021-04-23 23:24:23
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https://hk.answers.yahoo.com/question/index?qid=20091013000051KK01388