I'm sorry for the type! A set with two elements has four subsets, the empty set, two subsets wit one element, and the full set.
I'm sorry for the type! A set with two elements has four subsets, the empty set, two subsets wit one element, and the full set.
Oh. 0, 01, 10, 11 ;>
Binomial coefficients: k out of n 1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 1 5 10 10 5 1 1 6 15 20 15 6 1