Ronghua Zhang wrote:
>Suppose there exist N distinct objects, each time get n objects out
>of them(these n objects must be different) and then put them back,
>keep sampling for k rounds, and at last, what is the
>probability of at least x distinct objects have been
>selected at least once?
Look at the complementary event: what is the probability P
that exactly N - x distinct objects have not been selected?
Then the probability you seek is 1 - P .
=================================================================
Instructions for joining and leaving this list and remarks about
the problem of INAPPROPRIATE MESSAGES are available at
http://jse.stat.ncsu.edu/
=================================================================
