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Probability mass functions

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8. A tetrahedron shaped die gives one of the numbers 1, 2, 3, 4 with equal probabilities. We rolltwo of these dice and denote
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2. asked by Ethan
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Prove that the Px(x) is probability mass functionPx (x)=( I\14 x^ 2 if x £[1,2,3,4]) 0. Otherwise
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2. asked anonymously
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