A couple decides to keep having children until they have at least one boy and at least
Chapter 4, Problem 17(choose chapter or problem)
A couple decides to keep having children until they have at least one boy and at least one girl, and then stop. Assume they never have twins, that the trials are independent with probability 1/2 of a boy, and that they are fertile enough to keep producing children indefinitely. What is the expected number of children?
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