1. How did we get the type 2 negative binomial to be in the format as it is in the solution as it is different to what is given in the tables? 2. How does the expansion of the binomial coefficients work?
1. relationship between Gamma function \(\Gamma \) and factorial \( ! \) is \(\Gamma(n)=(n-1)! \) - now you can link the answer. 2. https://en.wikipedia.org/wiki/Binomial_coefficient
