% Example 2.6.20 p 109 in
% Larsen & Marx (2006) Introduction to Mathematical Statistics, 4th edition
% Writtten by Eugene Gallagher, Eugene.Gallagher@umb.edu
% http://alpha.es.umb.edu/faculty/edg/files/edgwebp.html
% Written 1/15/2011 & last revised 1/16/2011
% How many ways are there to read 20 pages in 3 different blocks of time 
% over a 20-d period?
nchoosek(19,2)