The answer is 1/2, but I'm really confused with the part that says "given that a 2 or a 3 was drawn".

How did 1/2 come about?

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#### Best Answer

There are the same number of 3's in the deck as there are 2's (i.e. both have 4 chances to be drawn). So if you know that a 2 or a 3 was drawn, then the chance of one vs. the other must be the same. As the probabilities of the two cases must sum to one, then each must be 1/2.

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