function [] = chap_3_prob_71()
% 
% 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; 

pD = (1/8)*(1/8 + 3/8) + (3/8)*( 1/8 + (1/2)*(3/8) ) + (3/8)*( (1/2)*(1/8) ) 

pG = (1/8)*( 3/8 + 1/8 ) + (3/8)*( (1/2)*(3/8) + (1/8) ) + (3/8)*(1/2)*(1/8) 

pB = (3/8)*( (1/2)*(3/8) + (1/2)*(3/8) ) + (3/8)*( (1/2)*(1/8) + (3/8) + (3/8) + (1/2)*(1/8) ) + (1/8) 

pD + pG + pB