74. Let (,...,) denote the joint moment generating function of X > > Xn

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74. Let ö(ßß,...,ßç) denote the joint moment generating function of X\ > · · · > Xn ·

(a) Explain how the moment generating function of Xi9 Ö×ß(ßß)> can be obtained from ö(ß÷, ..., tn).

(b) Show that ×ë, ...,Xn are independent if and only if

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