求解释- math(陈向东)

wanqiu.beijing · 发表于 2017-6-15 05:00:12

求解释
There are 27 students on the college debate team, What is the probability that at least, 3 of them have their birthdays in the same month?
A. 0
B. 3/27
C. 3/12
D. 1/2
E. 1

SCHAKAL2017 · 发表于 2017-6-15 05:53:17

1 2 3 4 5 6 7 8 9 10 11 12

1 2 3 4 5 6 7 8 9 10 11 12

1 2 3

选 E

wanqiu.beijing · 发表于 2017-6-15 06:46:18

SCHAKAL2017 发表于 2017-6-15 05:53
1 2 3 4 5 6 7 8 9 10 11 12

1 2 3 4 5 6 7 8 9 10 11 12

不好意思，我没看懂啊，可以帮我详细解答一下吗？我其实甚至没有弄明白问题的意思

求解释- math(陈向东)

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