probability question

Calculus
Tutor: None Selected Time limit: 1 Day

In a roomful of 30 people, what is the probability that at least two people have the same birthday? Assume birt hdays are uniformly distributed and there is no leap year complication.

Jul 28th, 2015

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In a roomful of 30 people, what is the probability that at least two people have the same birthday? Assume birt hdays are uniformly distributed and there is no leap year complication.

P(all different) =  365/365 365/364 363/365.......336/365(under 30 %) .

 Therefore, the probability that at least two birth days match is over 7 0% !

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Jul 29th, 2015

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