NEGBINOMDIST(f,t,p)
f: number of failures
t: threshold number of successes
p: probability of a success
If f or t is a non-integer it is truncated. If (f + t -1) <= 0 this function returns a #NUM! error. If p < 0 or p > 1 this functions returns a #NUM! error.
This function is Excel compatible.
BINOMDIST, COMBIN, FACT, HYPGEOMDIST, PERMUT.