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Find the probability that a hand of five cards in poker contains four cards of one kind.
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Find the probability that a hand of five cards in poker contains four cards of one kind.
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Case 1: 4 Ace, 1 card can any out of remaining 48
Case 2: 4 cards of face '2', 1 card can any out of remaining 48
And so on for each 13 kinds.
So, probablity = $\frac{\binom{48}{1}*13}{\binom{52}{5}}$ = $\frac{1}{4165}$
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