1. what is the fourth term in the expansion of (x + 4y)^6?

a) 7680x^3y^3
b) 3840x^2y^4
c)1440x^2y^4
d)1280x^3y^3

2. a bag contains 6 red marbles, 4 blue marbles, 7 green marbles, and 3 yellow marbles. a marble is drawn from the bag and is not replaced. then a second marble is drawn. what is the probability that both marbles drawn were green?

option a: 49/380
option b: 49/400
option c: 21/190
option d: 21/200