posted by Anonymous .
Urn A contains R red balls and W white balls, urn B contains r red balls and w white balls.
a.If an urn is selected at random and a ball drawn, what is the probability that the ball is red?
b.If a ball is drawn from urn A and put into urn B, and then a ball is drawn from urn B, what is the probability that the second ball is red?
c.If A and B are independent events, then prove that A^C (A raise to C) and B^C (B raise to C) are also independent.
a. R/(R+W) + r/(r+w) = ?
It's a start.