# Expected number and variance

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A couple decides to continue to have children until a daughter is born, what is the expected number of children of this couple? If there is a population with many such couples, what is the variance of the number of children per family in this population?

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##### Solution Summary

The solution calculates the expected number of children and variance of the number of children per family for a population of couples that decide to continue to have children until a daughter is born.

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