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The range of a discrete random variable X is {−1, 0, 1}. Let MX(t) be the...

The range of a discrete random variable X is {−1, 0, 1}. Let MX(t) be the moment generating function of X, and let MX(1) = MX(2) = 0.5. Find the third moment of X, E(X^3 )

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