number_f,number_s,probability_s!Returns the negative binomial distribution, the probability that there will be Number_f failures ...

!number_f,number_s,probability_s!!Returns the negative binomial distribution, the probability that there will be Number_f failures before the Number_s-th success, with Probability_s probability of a success!is the number of failures!is the threshold number of successes!is the probability of a success; a number between 0 and 1!