with joint probability mass function

Let X and Y be two distrete random variables with joint probability mass function (PMF) given by: cy^x if x = 2,3 ; y= 1,2pX,Y (x,y)= 0 otherwisea) find cb) find E[X^2Y]c) Find P(X=3 |Y=2)d) Define a new random variable Z= X-2Y. FInd P( Z<=0)

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