A bag contains..............................in simplest form?

Question: A bag contains 2 red marbles and 3 black marbles. if abby picks a marble without looking, returns it to the bag, and then draws a second marble, what is the probability that both marbles are red? give the answer as a fraction in simplest form?

If we are assume that abby picks a marble without looking and returns it to the bag and then draws a second marble. There is some probability that both marbles are red is  4/25. It is simply calculated by the formulla.