Based on data collected by the National Center for Health Statistics and made available to the public in the Sample Adult database, an estimate of the percentage of adults who have at some point in their life been told they have hypertension is 23.53 percent. If we select a simple random sample of 20 U.S. adults and assume that the probability that each has been told that he or she has hypertension is .24, find the probability that the number of people in the sample who have been told that they have hypertension will be exactly 3?
P(x) = (nCx)(p^x)[q^(n-x)]
x = 3
n = 20
p = .24
q = 1 - p
(nCx) this is the part that I can not finger out