The best way to do these is to diagram them. You'll then be able to count the permutations.By diagramming simple problems like these, you learn the probability formulas that enable you to solve more complicated ones.1. Draw A, B, C, and D. Draw three different lines from A to B, four from B to C and three from C to D. For each of the three routes from A to B there are four routes from B to C. Therefore, there are 12 (3x4) ways to get from A to C. For each of these 12, there are 3 ways to get from C to D. Therefore, there are 36 (3x4x3) different ways to get from A to D.Continue in the same manner with the others.
