function [] = chap_3_prob_14()
% 
% Written by:
% -- 
% John L. Weatherwax                2006-08-28
% 
% email: wax@alum.mit.edu
% 
% Please send comments and especially bug reports to the
% above email address.
% 
%-----
  
%format rat; 

p1 = 7 / (5+7);
p2 = 9 / (5+9); 
p3 = 5 / (5+11); 
p4 = 7 / (7+11); 

p1*p2*p3*p4