BINOMDIST(n,trials,p,cumulative)
BINOMDIST function returns the binomial distribution. n is the number of successes, trials is the total number of independent trials, p is the probability of success in trials, and cumulative describes whether to return the sum of the binomial function from 0 to n.
BINOMDIST(3,5,0.8,0) equals 0.2048.