a. A box contains 5 blue balls, 3 black balls, and 2 red balls of the same size. A ball is selected at random from the box and then replaced. A second ball is then selected. Find the probability of obtaining: two red balls

b. A box contains 5 blue balls, 3 black balls, and 2 red balls of the same size. A ball is selected at random from the box and then replaced. A second ball is then selected. Find the probability of obtaining: two blue balls or two black balls

c. A box contains 5 blue balls, 3 black balls, and 2 red balls of the same size. A ball is selected at random from the box and then replaced. A second ball is then selected. Find the probability of obtaining: one black ball and one red ball in any order