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8. If a cumulant generation function Rx (t) = In[Mx (t)], where Mx (t) = E(etx) = Cep(x) Prove that E(X2) = [RX (0)] +

8. If a cumulant generation function Rx (t) = In[Mx (t)], where Mx (t) = E(etx) = Cep(x) Prove that E(X2) = [RX (0)] + RX(0)

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