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If the probability mass function of a random variable is given by ( = ) = 3 , = 1,2,3,4, (i) The value of .

If the probability mass function of a random variable is given by ( = ) = 3 , = 1,2,3,4, (i) The value of . (ii) P( 1 3 < X < 5 3 / X > 0 )

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