If a given set has thirteen elements how many subsets have somewhere from four through eight elements

Of elements, there are ways of choosing any elements. So the number of subsets that can be chosen from the set of 13 elements, each consisting of 4 to 8 elements, is



To compute the actual numbers, you have, for example,







so there are 715 ways of picking subsets of size 4. Compute the others similarly, then add them up.

Sorry i don't really know and i don't have time

A) 144.44 sq inches i believe