How many subsets of {1,2,3,4,5,6,8,10,15} are there for which the sum of the elements is 15.
12
({15}{5,10}{1,4,10}{1,6,8}{2,3,10}{2,5,8}{3,4,8}{4,5,6}{1,2,4,8}{1,3,5,6}{2,3,4,6}{1,2,3,4,5})
