in reply to Re: Birthday Chances

in thread Birthday Chances

you're close on the math.

(ignoring leap-years) the probability that n people all have different birthdays is: ` ((365-1)/365) * ((365-2)/365) * ((365-3)/365) * . . . * ((365-n+1)/365) = 365! / ((365-n)! * 365^n)`

setting that equal to 50% and solving is probably harder than just plugging in numbers on a calculator till you get it. 23 is the magic number.

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Re: Re: Re: Birthday Chances
by ckohl1 (Hermit) on Feb 15, 2002 at 22:56 UTC |

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Cool Uses for Perl

Comment onRe: Re: Birthday Chances