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There are 27 students on the collage debate team. What is the probabil

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There are 27 students on the collage debate team. What is the probabil [#permalink] New post 20 Oct 2010, 06:57
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Question Stats:

37% (01:26) correct 63% (00:43) wrong based on 35 sessions
There are 27 students on the collage 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
[Reveal] Spoiler: OA

Last edited by Bunuel on 31 Oct 2014, 03:22, edited 1 time in total.
Renamed the topic and edited the question.
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Re: There are 27 students on the collage debate team. What is the probabil [#permalink] New post 20 Oct 2010, 09:14
worst case
--------------
even distribution of 27 students' birth months across 12 months..
after 24 students, each month will have 2 students' birthday. The rest 3 students' birthday can go in to any month
making the count to 3 or more.

So this is always true or the situtaion will exists all the time and hence the probability should be 1 (E)

(put little more description)
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Re: There are 27 students on the collage debate team. What is the probabil [#permalink] New post 31 Oct 2014, 02:53
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Re: There are 27 students on the collage debate team. What is the probabil   [#permalink] 31 Oct 2014, 02:53
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