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Learning Math Home
Patterns, Functions, and Algebra
From: ab kal (comp_engg@msn.com)
Date: Tue Apr 22 2003 - 08:49:25 EDT

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    An urn contains two white balls and four red balls.Balls are drawn one by
    one without replacement until two white balls have appeared.Denote by U the
    number of balls that must be drawn until both white balls have
    appeared.Compute the pf(probability function) of U.

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