help -- a probality problem

From: lucy (losemind_at_yahoo.com)
Date: 11/13/04 

Date: Sat, 13 Nov 2004 15:28:18 -0800

Suppose we flip a unfair coin with prob. p it is head, with prob. 1-p it is
tail.

So the prob. of head is p.

I flip the coin N times,

what is the prob. of head(for one flip) if I know that there are at least K
heads? i.e. given at least K heads?

what is the prob. of M heads given at least K heads?

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