55. Suppose that the joint probability mass function of X and Y is P(X = i, Y...
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55. Suppose that the joint probability mass function of X and Y is P(X = i, Y = j) =
j i
e−2λλj
/ j!, 0 ≤ i ≤ j
(a) Find the probability mass function of Y .
(b) Find the probability mass function of X.
(c) Find the probability mass function of Y − X.
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