Find the probability that when a hand of 7 cards is drawn from well sheffled deck of 52 cards, it contians (i) all kings (ii) 3 Kings (iii) atleast 3 Kings.
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` = P(A) + P(B) + P(C ) + - P(B nn C) - P(A nn B) - P(A nn C) + P(A nn B nn C)`
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