Suppose you choose a marble from a bag containing 2 red marbles, 5 white marbles, and 3 blue marbles. You return the first marble to the bag and then choose again. Find P (red then blue)

Red: 2

White: 5

Blue: 3

Total marbles: 10

P (R, B) : (2/10) * (3/10) = 6/100 (with replacement)

Putting the marble back in the bag

if without replacement, not putting back in then:

P (R, B) : (2/10) * (3/9) = 6/90