Aldo always takes the blue bus. STRATEGY: Make a table that shows the choices
for Aldo. He can either take yellow or blue. If
he takes yellow, there are two options for Brenda
and Cory. If he takes blue, there are four choices
for Brenda and Cory.

Aldo 
Brenda 
Cory 
A 
yellow 
yellow 
yellow 
B 
yellow 
blue 
blue 
C 
blue 
blue 
blue 
D 
blue 
yellow 
yellow 
E 
blue 
yellow 
blue 
F 
blue 
blue 
yellow 
Now
go back to the information in the problem and
eliminate the impossible cases. Number 2 makes
case A and E impossible, so cross them out. Number
3 makes case B impossible, so cross that out.
That leaves only cases D and F. Aldo takes the
blue bus in both.
