Expectations of Family Sizes Subject to Minimum Numbers of Each Gender
Martin Griffiths
Mathematical Institute
University of Oxford
Oxford OX1 3LB
United Kingdom
Alexander Bramham
Wadham College
University of Oxford
Oxford OX1 3PN
United Kingdom
Abstract:
We consider the infinite families of sequences that arise from a
scenario involving the expected number of children born to a married
couple when certain conditions are placed on the minimum number of each
gender. We obtain both exact and asymptotic formulas for these
expectations, and go on to consider the long-term behavior of sequences
derived from them. For the situations studied here, it is shown that
the long-term behavior of each of the resulting sequences always falls
into one of two distinct categories.
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(Concerned with sequence
A159061.)
Received December 14 2012;
revised version received January 1 2013.
Published in Journal of Integer Sequences, January 1 2013.
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