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People are arbitarily selected one by one, and their eye-color recorded as blue" or not blue". Assume that 20 percent of people have blue eyes. Let Xb be number of people selected until first person with blue eyes shows up, let Xn be number of people selected until first person with non-blue eyes shows up, and let X be number of people select until first person with different eye color to preceding people shows up. Find out E(Xb), E(Xn) and E(X).

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