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A random variable XXX has the probability mass function P(X=k)=13(23)kP(X=k) = \frac{1}{3} (\frac{2}{3})^kP(X=k)=31​(32​)k for k=0,1,2,…k=0, 1, 2, \dotsk=0,1,2,…. What is the variance Var(X)Var(X)Var(X)?