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

14.26%

  • Interview Candidate
  • 5
  • 2012

Showing Answers 1 - 5 of 5 Answers

josh

  • May 22nd, 2006
 

1/52 * 1/52 * 3??

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Chul Min Kang

  • Nov 2nd, 2007
 

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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