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Let XXX have a Pareto distribution with PDF f(x)=axa+1f(x) = \frac{a}{x^{a+1}}f(x)=xa+1a​ for x≥1,a>0x \ge 1, a > 0x≥1,a>0. For which values of aaa does E[X2]E[X^2]E[X2] exist?