My Math Forum geometric jointly distributed random variables

 April 5th, 2010, 01:37 PM #1 Member   Joined: Jan 2010 Posts: 43 Thanks: 0 geometric jointly distributed random variables Suppose that X and Y are independent geometric random variables with the same parameter p. Compute the following: P(X=i|X+Y=n) hint: Imagine that you continually flip a coin having probability p of coming up heads. If the second head occurs on the nth flip, what is the probability mass function of the time of the first head? I don't understand how the hint helps, but any incite in the right direction is greatly appreciated. Thanks!

 Tags distributed, geometric, jointly, random, variables

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