A bag contains 3 green marbles and 7 white marbles.

Question

Two marbles are randomly picked from the bag, one at a time, with replacement. Find the probability of picking a green and a white marble.

Answer 1

₃C_1•7C_{1 ÷ 10}C₂ is your answer based on choosing a green and then a white, out of all possible choices of two marbles.