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![[parent]](http://images.planetmath.org:8080/images/uparrow.png) Viewing Message
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| ``Re: How many needed''
by Mathprof on 2006-08-12 12:03:17 |
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| Something does not see right here.
The table in the entry shows for 20 people a probability of .41
for a duplicate. So the answer ought to exceed 20.
i checked Feller's book An Introduction to Probability Theory
and its applications, vol I, 2nd ed. c 1957
and he has a problem (pag 224, problem 18 and 19) to find the n
so that the expected number of multiple birthdays in a group of
n people exceeds 1. His answer is n>=28. |
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