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A couple decides to have 3 children. If none of the 3 is a girl, they will try again; and if they still don't get

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A couple decides to have 3 children. If none of the 3 is a girl, they will try again; and if they still don't get a girl, they will try once more. If the random variable X denotes the number of children the couple will have following this scheme, then what is the expected value of X

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