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Question - Probability Distribution - Probability Mass Function (P.M.F.)

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Question

If X is a random variable with probability mass function

P(x) = kx ,  x=1,2,3

      = 0 ,     otherwise

then , k=..............

(a) 1/5

(b) 1/4

(c) 1/6

(d) 2/3

 

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