Binomial Distributions Part IV

Example

x=y=1/2, n = 8, r =7

We could use this formula to find the probability of six Aa and two aa progeny in a family of size eight.

n = 8, r = 6, n-r = 2, x = 1/2, y = 12

P(six Aa, 2aa) =

n nnnnnnnnnnnnnnnnnnnnn 

n nnnnnnnnnnnnnnnnnnnnn