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Conditional Distribution

  • Thread starter cse63146
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  • #1
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Homework Statement



A card is picked at random from N cards labeled 1,2,...,N and the number that appears is X. A second card is picked at random from cards numbered 1,2,..., X and its number is Y. Find the conditional distribution of X given Y = y.

Homework Equations



[tex]P(X = x | Y = y) = \frac{P(X = x , Y = y)}{P(Y = y)}[/tex]


The Attempt at a Solution



From what I understand, there are two decks. The first deck has N cards, while the second deck has X cards, which depends on the value of the card chosen from the first deck, hence x and y are not independent.

I know that [tex]P(Y = y) = \frac{1}{x}[/tex]

I'm not sure how to find P(X = x , Y = y).

Any help would be greately appreciated. Thank you.
 

Answers and Replies

  • #2
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What is the value of P(X=x)? What does P(x,y) mean in general?
 

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