Lets say you have a bunch of projects to do, says project 1,2,3,4,5. You dont have to do them all, in fact you dont have to do any of them...and the order you did them in has no effect on how they come out. how many ways can this be done? examples, 12, 1234, 234 or no projects at all edit: My quick assumption to solving this problem is that you either do the project or you dont...so i guess you have 2 choices 5 times. 2*2*2*2*2 = 32, is this the solution?