statistics problem

Let X and Y be random variables with joint PMF as follows: Y f(x, v) O 1 2 3 O 0.03 0.05 0.01 0.01 1 0.03 0.05 0.01 0.01 X 4 0.15 0.15 0.05 0.05 9 0.09 0.25 0.03 0.03 A. Find the marginal PMF of X. B. Find the marginal PMF of Y. C. Are X and Y independent? Explain. D. Find P(2Y > X)