The joint probability mass function (p.m.f.) of π and π is π(π₯, π¦) = π₯π¦^2 /π, (π₯, π¦) = (1,1), (1,2), (2,2) where π₯ and π¦ are nonnegative integers. (i) Find the marginal p.m.f. of π and π. (ii) Find π(π < π). (iii) Find πΈ(π|π)