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Jan 18th, 2018
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  1. (1) E(X) = 1/2 * ( 2 + 3*(1/2) + 4*(1/2)^2 + 5*(1/2)^3 + ... )
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  3. (2) 1/2*E(X) = 1/2 * ( 2*(1/2) + 3*(1/2)^2 + 4*(1/2)^3 + ... )
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  5. (3) 1/2*E(X) = 1/2 * ( 2 + 1/2 + (1/2)^2 + (1/2)^3 + ... )
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