Find the degree of the polynomial and indicate whether the polynomial is monomial, binomial, trinomial, or none of them. (I also need the degree of the polynomial)

-2^4xy^4

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?