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A red herring marble (Posted on 2012-05-01) Difficulty: 1 of 5
An urn contains 3333 marbles : 2001 black,999 white and 333 red.
You are requested to draw randomly a pair of marbles and to obey the following rules:
If none of them is red - discard both of them.
If only one of the marbles is red discard the non-red marble and return the red one to the urn.
If both are red - discard both of them.

Continue drawing pair by pair and discarding as told until there is only a single marble left.

What is the probability of the last one being red?

See The Solution Submitted by Ady TZIDON    
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  Subject Author Date
SolutionOne fish two fish red fish blue fish (solution)Jer2012-05-01 12:11:34
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