Posted by marie on .
using the fundamental counting principle with three or more groups of items
There are three highways from city A to city B, two highways from city B to city C,and four highways from city c to city D. How many different highway routes are there from city A to city D?

math 
MathMate,
Similar to the pizza topping problem:
http://www.jiskha.com/display.cgi?id=1314030794