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birthday probability

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Manager
Manager
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Joined: 07 Feb 2010
Posts: 162
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Kudos [?]: 96 [0], given: 101

birthday probability [#permalink] New post 20 Oct 2010, 06:57
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

55% (01:04) correct 45% (00:02) wrong based on 11 sessions
there are 27 students in one college debate team. the probability that atleast 3 of them have their birthdays in the same month
a 0
b 1/9
c 1/4
d 1/2
e 1
[Reveal] Spoiler: OA
Manager
Manager
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Joined: 30 Sep 2010
Posts: 59
Followers: 1

Kudos [?]: 29 [0], given: 0

Re: birthday probability [#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)
Re: birthday probability   [#permalink] 20 Oct 2010, 09:14
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