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प्रश्न
Four cards are drawn from a pack of 52 cards. Find the probability that at least one heart.
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उत्तर
4 cards can be drawn out of 52 cards in 52C4 ways.
∴ n(S) = 52C4
Let C be the event that out of the four cards drawn at least one is a heart.
∴ C′ is the event that all 4 cards drawn are non-heart cards.
In a pack of 52 cards, there are 39 non-heart cards.
∴ 4 non-heart cards can be drawn in 39C4 ways.
∴ n(C′) = 39C4
∴ P(C′) = `("n"("C'"))/("n"("S")` = `(""^39"C"_4)/ (""^52"C"_4)`
∴ P(C) = 1 – P(C') = `1 - (""^39"C"_4)/(""^52"C"_4)`
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