Question

a bottle contains 12 red marbles and 8 blue marbles. A marble is chosen at random and not replaced. Then a second marble is chosen at random. Determine the probability that the two marbles are not the same color.

Answer 1

`P(A)= (12)/(20) \cdot (8)/(19) + (8)/(20) \cdot (12)/(19)= (12\cdot8)/(20\cdot19) \cdot2=(12\cdot4)/(5\cdot19)= (48)/(95)`