Prove the following statements about the sets a, b and c. within your arguments, you may find it useful to argue directly and/or to use the contrapositive form. remember that to show that two sets are equal, we show that each one is a subset of the other; also remember that to show that s is a subset of t, we argue "let x , aha! therefore x et." (a) a n (b \ c) = (an b) \ (a n c) (b) (aub)\(anb)= (a \ b) u (b \ a)