(B) In the bottom sock drawer there are four skeleton-foot socks, and seven unmatched socks. (a) Write the mathematical expression equivalent to "choosing 2 socks from the drawer" (b) Write the mathematical expression that would be useful if you choose 4 socks from the drawer, and the first two will go on Abigail's feet while the second 2 go on Adin's feet. (c) Write the mathematical expression which models the set up to the solution of "the probability two randomly drawn socks are a matched pair"