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[" The p.m.f.of a random variable "X" is "],[[P(x),=(3-x)/(10),quad x=-1,0,1,2],[,=0,," otherwise "]],[" The value of "E(X)" is "],[[" (A) "," (В) "," (В) ",,],[" (В) "," (В) "," (В) ",]]

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