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Math Help - BIrthday probability

  1. #1
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    BIrthday probability

    Find the probability that in a group of 3 people no two have the same birthday assuming that a year has 365 days .
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  2. #2
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    Quote Originally Posted by mathaddict View Post
    Find the probability that in a group of 3 people no two have the same birthday assuming that a year has 365 days .
    Can you find the probability that 2 people from 3 DO have the same birthday?
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  3. #3
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    probability that all will have different Birthdays
    =(365X364X363
    ) /( 365X365X365)

    =(364X363) / (365X365)
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  4. #4
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    Quote Originally Posted by mathaddict View Post
    Find the probability that in a group of 3 people no two have the same birthday assuming that a year has 365 days .
    Same technique as post #6 in this thread: http://www.mathhelpforum.com/math-he...-problems.html

    Google birthday paradox for a lot more info.
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