Question

A bag contains 6 purple marbles and 4 green marbles and 3 blue marbles. A marble is drawn at random and is replaced. Then a second marble is drawn. What is the probability that both marbles are purple?

Answer 1

Since you are returning the marble the second event is not dependent
on the first.
Prob(2 purple) = (6/13)(6/13) = ...

Answer 2

6/13