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2.1-9 Let the pmf of X be defined by f (x) = (1+ lx - 30) /1 1, x=1, 2, 3, 4, 5. Find P

2.1-9 Let the pmf of X be defined by f (x) = (1+ lx - 30) /1 1, x=1, 2, 3, 4, 5. Find P (X

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