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You pick a card at random. Without putting the first card back, you pick a second card at random.

2
3
4
5

What is the probability of picking a 4 and then picking a 3?

The probability of picking a 4 first is 1/4. Without replacing the card, the probability of picking a 3 second is 1/3. So the probability of picking a 4 then a 3 is (1/4) * (1/3) = 1/12.