Hi @lporfiris Yes, that is a safe assumption (GARP should "battery-test" all exam question) however please note that, in the case of the binomial pmf, the binomial coefficient can typically be simplified, and you would be expected to know how to do that. For example, the binomial probability of exactly 18 successes in 20 trials is given by p^18*(1-p)^2*20!/(18!*2!), but 20!/(18!*2!) is easily simplified because 20! = 20*19*18* 17 .... such that 20!/18! = (20*19*18*17* ...)/(18*17*... ) = 20*19, so 20!/(18!*2!) = 20*19/2 = 190. I hope that's helpful!