Ononot — If the MGF of X is MX(t) = \frac{1}{4}e^{-t} + \frac{1}{2} +

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If the MGF of $X$ is $M_X(t) = \frac{1}{4}e^{-t} + \frac{1}{2} + \frac{1}{4}e^t$ , what is $Var(X)$ ?