The Binomial Distribution - GNU Scientific Library -- Reference Manual
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### 20.31 The Binomial Distribution

— Function: unsigned int gsl_ran_binomial (const gsl_rng * r, double p, unsigned int n)

> This function returns a random integer from the binomial distribution, the number of successes in n independent trials with probability p. The probability distribution for binomial variates is,

>               p(k) = {n! \over k! (n-k)! } p^k (1-p)^{n-k}

> for 0 <= k <= n.

— Function: double gsl_ran_binomial_pdf (unsigned int k, double p, unsigned int n)

> This function computes the probability p(k) of obtaining k from a binomial distribution with parameters p and n, using the formula given above.

— Function: double gsl_cdf_binomial_P (unsigned int k, double p, unsigned int n)
— Function: double gsl_cdf_binomial_Q (unsigned int k, double p, unsigned int n)

> These functions compute the cumulative distribution functions P(k), Q(k) for the binomial distribution with parameters p and n.

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