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red marble, blue marble

There's also an "aha!!!!!" answer to this one if the jars are
small enough so that the marbles are more than one level
deep.  First pour 25 blue marbles in each jar.  Then pour 25
red marbles in each jar so that they are on top of the blue
marbles.  When picking the marble from either jar, pick a
marble from the top layer.  That way the probability of
picking a red marble is 100%.

Art Corcoran
Tuesday, January 4, 2005

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