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Let X be the number of smokers in a family composed of a husband and wife. X is a random variable which takes the values

Let X be the number of smokers in a family composed of a husband and wife. X is a random variable which takes the values 0, 1, 2, with respective probabilities p0, p1, p2. The average number of smokers per family is 0.63. 40% of families contain at least one smoker.

Find the probabilities p0, p1 and p2.

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