Question: Random variables (X,. Isis) are called interchangeable if their joint df. is a symmetric function, ie, invariant under permutations, and evs (X1) are interchangeable if

Random variables (X,. Isis) are called interchangeable if their joint df. is a symmetric function, ie, invariant under permutations, and evs (X1) are interchangeable if every finite subset is interchangeable. Prove that if (X1) are, interchangeable rvs, then p(X, X20 Hint: X20

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