2. Let X₁ and X₂ have the joint probability mass function (pmf)f(x₁, x₂) =, x₁ = 1,2, x₂ = 1,2.
(b) The covariance of X₁ and X₂ is _(C)_.
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, x₁ = 1,2, x₂ = 1,2.