note
ehdonhon
<P>The question here is:
<TT>What are the chances of any n people not having unique birthdays?</TT>
That's a difficult question. But the cool thing about probability is
that you can always find the probability of something by subtracting the
probability of its inverse from one. So instead, ask:
<TT>What are the chances of any n people having unique birthdays?</TT>
That would be:<BR><BR>
(1/365) * ( 1/365 -1) * (1 /365 -2 ) * ... ( 1/365 - (n-1))<BR><BR>
And once you have that, the answer to the original question is:<BR><BR>
1 - ( (1/365) * ( 1/365 - 1 ) * ( 1/365 - 2) * ... ( 1/365 - (n-1)))<BR><BR>
<P>Now just plug in different values of n to find the odds of
n people not having unique birthdays.</P>
145571
145571