376.Exactly One Pair
★★★classical probabilityCh. 1 — Classical Probability and Combinatorics444+ Problems in Probability
A poker hand is five cards from a standard 52-card deck. What is the probability of a single pair — two cards of the same rank, with the other three cards of three different other ranks?
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Build the hand: pick the paired rank, its two suits, then three distinct other ranks and one suit each.
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