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Answer on Statistics and Probability Question for Jack

Question #40989
For some constant C, the random variable N has pmf

Pn(k) = C/k(k+1), k=1,2,...

(a) What is the numerical value of the constant C?
(b) Is it more likely that N will be even or odd number?
(c) Find a simple expression for the CDF of N. Simply.
(d) Find the mean and variance of N or show that they do not exist.
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