A bag contains 6 red marbles 9 blue marbles and 5 green marbles You withdraw one marble replace it and withdraw another marble What is the probability that you do not draw two green marbles 25 denomo?

Because you are replacing the marbles then it is an independent event.

P(1st one is not green) = 1 - P(first green),

equally P(2nd one is not green) = 1 - (second green),

Thus it reads P(¬G ^ ¬G) = P(¬G) * P(¬G)

= 15/20 * 15/20

= 225/400

= 9/16