Aptitude - In a group of 9 persons what is the probability that 3 persons have the same birthday in a week?

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In a group of 9 persons what is the probability that 3 persons have the same birthday in a week?

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Total Answers and Comments: 3

Last Update: November 02, 2007

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May 22, 2006 15:56:57

josh

RE: In a group of 9 persons what is the probability th...

1/52 * 1/52 * 3??

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November 04, 2006 12:18:50

itnovice

Member Since: November 2006 Contribution: 2

RE: In a group of 9 persons what is the probability th...

The answer should be like this:

(9*8*7/3*2*1)*53*53^6/53^9 2.99

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November 02, 2007 03:31:52

Chul Min Kang

RE: In a group of 9 persons what is the probability th...

I think the birth weeks of the other 6 guys must be different from those of the 3 guys. Therefore the answer should be....

(9*8*7/3*2*1)*53*(52^6/53^9)

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