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homework problem I-C 8.21

 
 
Picture of Bober Yang
homework problem I-C 8.21
by Bober Yang - Monday, 27 April 2020, 2:00 PM
 

I don't know how to do it, I tried a few ways but just can't get to the answer

 
Picture of David Reynoso
Re: homework problem I-C 8.21
by David Reynoso - Monday, 27 April 2020, 8:21 PM
 

This is similar to Example 8.1

The only difference is that you will make a stop at C. Note C is in between two blocks

Try to find first the number of ways to go from A to C. Then the number of ways to go from C to B. Finally, use the two to find all the ways to go from A to B stopping at C.