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

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Manager
Joined: 07 Feb 2010
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There are 27 students on the collage debate team. What is the probabil [#permalink]

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20 Oct 2010, 07:57
1
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4
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Difficulty:

55% (hard)

Question Stats:

46% (01:51) correct 54% (00:58) wrong based on 57 sessions

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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, 04:22, edited 1 time in total.
Renamed the topic and edited the question.
Manager
Joined: 30 Sep 2010
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Re: There are 27 students on the collage debate team. What is the probabil [#permalink]

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20 Oct 2010, 10:14
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]

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31 Oct 2014, 03:53
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: There are 27 students on the collage debate team. What is the probabil   [#permalink] 31 Oct 2014, 03:53
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