This article is from the Puzzles FAQ, by Chris Cole chris@questrel.questrel.com and Matthew Daly mwdaly@pobox.com with numerous contributions by others.
How many people must be at a party before you have even odds or better
of two having the same bithday (not necessarily the same year, of course)?
probability/birthday/same.day.s
23.
See also:
archive entry "coupon"
 
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