22. If the joint probability distribution of X₁ and X₂ is given by f(x1, x₂) = x1x2 36 for x₁ = 1,2,3 and x₂ = 1, 2, 3, find (a) the probability distribution of X₁ X2; (b) the probability distribution of X₁/X₂. 23. With reference to Exercise 22, find = (a) the joint distribution of Y₁ = X₁ + X₂ and Y₂ X₁ - X2; (b) the marginal distribution of Y₁.

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