probability again : GMAT Problem Solving (PS)
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# probability again

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11 Apr 2011, 06:46
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Question Stats:

75% (03:04) correct 25% (00:41) wrong based on 8 sessions

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If there are 85 students in a statistics class and we assume that there are 365 days in a year, what is the probability that at least two students in the class have the same birthday (assuming birthdays are distributed independently)?
A) (85/365)* (84/364)
B) (1/365)* (1/364)
C) 1- (85!/365!)
D) 1- (365!/ 280! (365^85))
E) 1- (85!/(365^85))
[Reveal] Spoiler: OA

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11 Apr 2011, 08:52
sdas wrote:
If there are 85 students in a statistics class and we assume that there are 365 days in a year, what is the probability that at least two students in the class have the same birthday (assuming birthdays are distributed independently)?
A) (85/365)* (84/364)
B) (1/365)* (1/364)
C) 1- (85!/365!)
D) 1- (365!/ 280! (365^85))
E) 1- (85!/(365^85))

probability-700-difficulty-level-92013.html
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Re: probability again   [#permalink] 11 Apr 2011, 08:52
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