A binomial experiment has the given number of trialsn

and the given success probabilityp

n.=12 p=.2

Find p(3)

Formula

{12!/3!(12-3)!}=220 how i came up with this answer (10*11*12)/1*2*3)

220*(.2^2)(1-.2)^9=1.181

What am I doing incorrectly?