Ononot — The MGF of X is MX(t) = \frac{1}{2}e^t + \frac{1}{2}e^{2t}.

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The MGF of $X$ is $M_X(t) = \frac{1}{2}e^t + \frac{1}{2}e^{2t}$ . What is $Var(X)$ ?