First Q A couple has 3 children. What is the probability that they have exactly

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First Q A couple has 3 children. What is the probability that they have exactly two boys?
Second Q If A and B are mutually exclusive events, then
P(A or B) = 0
P(A or B) = P(A).P(B)
P(A or B) = P(A) + P(B)
P(A or B) = P(A)/P(B)

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