



 
Hi Shawn, I drew a diagram of the ways to get from A to B and then from B to C. There are 4 roads from A to B and whichever one you choose you then have 3 roads to choose from to get to C. Hence there are $4 \times 3 = 12$ ways to get from A to C. Now add D to the diagram. How many roads are there from C to D? You didn't say. How many ways are there to get from A to D? Penny 



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