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se the marginal pmf for S to compute E(S) and E(S2). (b) Compute E(S + T ) directly from the joint pmf. (c) Noting that

se the marginal pmf for S to compute E(S) and E(S2). (b) Compute E(S + T ) directly from the joint pmf. (c) Noting that S and T have the same distribution, find a way to get E(S + T ) immediately from part (a), using a general property of expectation

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