Let X, X,...X, be 'n' random variable which are identically distributed such that Xg= 1 with a prob. of 1/2 = 2 with a prob. of 1/3 =-1 with a prob. of 1/6. Find (a) E [X, + X2 +... .. X,1 (b) E [X} + X3 +...X

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