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12.4. Let X1, X2, X3, ... be iid uniform(0,1) random variables, and for each n, set Yn = min{X1, X2, .. ., Xn}. (a) Prove that Y, -> 0 in probability as n - 0. (b) Does EllY, - 0]2] -+ 0 as n - co? Justify your assertion