Thursday, October 23, 2008

painting balls

You have a black box with N balls in it - each of a different color. Suppose you take turns as follows - randomly pick a ball in each hand,and paint the left hand ball the same color as the right hand ball. You replace both balls in the box before the next turn.

How many turns do you expect before all balls are the same color?

http://spellscroll.com/questionfull/118/

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