Question 387009
the size of subsets of a set: 
If a given set has twelve elements, how many of its subsets have the given numbers of elements? 
a) at most two elements.
at most 0 elements: 1
at most 1 element: 12
at most 2 elements: 12C2 = 66
---------------
# with at most 2 elements: 1+12+66 = 79
==========================================
cheers,
Stan H.