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The CDF of a discrete random variable X is given by F(x) = [x(x+1)(2x+1)]/ [n(n+1)(2n+1)], x...

The CDF of a discrete random variable X is given by

F(x) = [x(x+1)(2x+1)]/ [n(n+1)(2n+1)], x =1,2,….n.

Derive the probability mass function.

       Show that it is a valid probability mass function.

Math   Statistics-And-Probability   
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TOPIC:Finding the pmf from the cdf.

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