Question 309422
20 R, red
15 B, black
35 total to start
P(R)=20/35=4/7
w/o replacement
P(R)=19/34
w/o replacement
P(R)=18/33=6/11
w/o replacement
P(R)=17/32
Multiply the probabilities,
P(R,R,R,R)=(4/7)(19/34)(6/11)(17/32)
P(R,R,R,R)=(19*3)/(7*2*11*4)
P(R,R,R,R)=57/616