You can put this solution on YOUR website! If I am dealt 4 cards from a deck of 52 cards what is the probability that all 4 will be hearts?
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# of sets of 4 hearts: 13C4
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# of sets of 4 random cards: 52C4
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P(set of 4 hearts) = 13C4/52C4 = 0.002641..
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Cheers,
Stan H.