A box contains 4 white balls and 5 red balls. I draw 3 of them out of the box, one at a time, and set them aside. What is the probability that all three balls have the same color?
P(www)+P(RRR)
P(WWW)= \(\frac{4}{9}*\frac{3}{8}*\frac{2}{7}\)
You can continue from there