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4. 七月 2004, 23:54:54

Kevin

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If you know you are not drawing from the group that has two, then you have not accounted for that in your math. Also, it does matter whether the group has four or the group has three. The chances of selecting each individual card is the same (1 / (# of cards)) - not the chance of getting a 9 is the same as getting a Queen, regardless of how many of each are left.