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#31
08-18-2006, 03:07 PM
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Re: Envelopes
[ QUOTE ]
[ QUOTE ] [ QUOTE ] This reminded me of this problem: You have a black box with a slot in the front and a button. There are an unknown number of marbles in the box, one of which is white, all the rest are black. The box is magic, in that the number of balls that may fit in the box does not depend on its physical size. Each time you press the button, the box spits out a marble, chosen at random from the marbles within. You push the button N times, and on the Nth attempt, the white marble is ejected. About how many marbles would you say are in the box, why, and how certain are you? [/ QUOTE ] is there a logical answer to this [/ QUOTE ] Since the box could contain an infinite number of marbles, I don't see how you could guess how many are left after the white marble comes out. But I suck at these logic puzzles so I'm probably missing something. [/ QUOTE ] i guess the logical answer would be 2N...but i dunno 
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