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Let X1 be a random variable whose value is the result of rolling an 8-sided die, and X2 a random variable whose value is the

Let X1 be a random variable whose value is the result of rolling an 8-sided die, and X2 a random variable whose value is the result of rolling a 12-sided die. (1) Find E(X1 + X2). (2) Find E(X^21 + X^22). (3) Find V(X1 + X2).

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