__Random:__unsigned int**gsl_ran_negative_binomial***(const gsl_rng **`r`, double`p`, double`n`)-
This function returns a random integer from the negative binomial
distribution, the number of failures occurring before
`n`successes in independent trials with probability`p`of success. The probability distribution for negative binomial variates is,Note that @math{n} is not required to be an integer.

__Function:__double**gsl_ran_negative_binomial_pdf***(unsigned int*`k`, double`p`, double`n`)-
This function computes the probability @math{p(k)} of obtaining
`k`from a negative binomial distribution with parameters`p`and`n`, using the formula given above.

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