Suppose a couple will continue having children until they have at least two children of each sex

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Suppose a couple will continue having children until they have at least two children of each sex (two boys and two girls). How many children might they expect to have?
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Stats Data and Models

ISBN: 978-0321986498

4th edition

Authors: Richard D. De Veaux, Paul D. Velleman, David E. Bock

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