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There are ten different books in a sale, five of them cost 4 USD each, three cost 1 USD each, and two cost 3 USD each. Find the probability that for randomly chosen three books a buyer pays...

Let Ω = {a, b, c}. Find the value α such that the function p defined by relations p(a) = 0, 1, p(b) = α, p(c) = 2α be a probability mass function. Find the probabilities of events {a, b},...

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