What is probability that it contains exactly k white balls

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An urn contains m white and n black balls. If a random sample of size r is chosen, what isthe probability that it contains exactly k white balls?

• If we throw 4 dice, and each outcome is equally likely. Then what's the probability of gettingexactly one 6?

• Two cards are randomly selected from an ordinary playing deck. What is the probability thatthey form a blackjack? That is, what is the probability that one of the cards is an ace andthe other one is either a ten, a jack, a queen, or a king?

Reference no: EM132154772

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