two fair dice are thrown once. given that the sum od the numbers obtained is greater than 8, find the probabilities of the following events happening.
a)at least one 5 is obtained.
b)at least one even number is obtained.
maths probability
2012-02-25 6:29 pm
回答 (1)
2012-02-25 11:43 pm
✔ 最佳答案
The sample space is {(3,6), (4,6), (4,5), (5,6) ,(5,5), (5,4), (6,6), (6,5), (6,4), (6,3)}(a) P(at least one 5 is obtained)
= 5/10
= 1/2
(b) P(at least one even number is obtained)
= 8/10
= 4/5
收錄日期: 2021-04-27 17:43:25
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