Question: Suppose n balls are distributed at random into k boxes. Let X i = 1 if box i is non-empty, and X i =0 otherwise.

Suppose n balls are distributed at random into k boxes. Let X_i = 1 if box i is non-empty, and X_i =0 otherwise. Argue that Corr{X_i,X_j}=Corr{X₁,X₂} for all i = j and findCorr{X₁,X₂}.

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