3 Aug
2004
3 Aug
'04
12:25 p.m.
--- Bernie Cosell <bernie@fantasyfarm.com> wrote:
A dumb question -- I've apparently forgotten nearly all of my probability [sigh]: Given selection-with-replacement from a set of N items, what's the formula for how many picks you need to make to have a P% probability of drawing each item at least once?
/Bernie\
Let P(N,n) be the probability that in n picks each of the N items is drawn at least once. Then P(N,n) equals n! times the coefficient of t^n in [exp(t/N)-1]^N. Gene __________________________________ Do you Yahoo!? New and Improved Yahoo! Mail - Send 10MB messages! http://promotions.yahoo.com/new_mail