
Jon S. answered 09/26/20
Patient and Knowledgeable Math and English Tutor
There are 6 * 4 = 24 cards that are eight or higher out of a deck of 52 cards (4 8's, 4 9's, 4 10's, 4 J's, 4 Q's, 4 K's).
N = number of items in population = 52
k = number of items that are qualified as successes = 24
n = number of items in sample = 5
x = number of items that qualify as successes = 3
Probability that an n trial hypergeometric experiment results in exactly x successes when the population consists of N items, k of which are classified as successes:
h(x;N,n,k) = C(k,x) * C(N-k,n-x) / C(N,n)
= C(24,3) * C(28,2) / C(52,5)
where C(24,3) is number of combinations of 24 taken 3 at a time = 24! / 21! 3 !
similarly for C(28,2) and C(52,5)