A bag of marbles contains 3 yellow, 6 blue, 1 green, 8 orange.
1. What is the probability of selecting a yellow followed by blue if the first marble was replaced
2. Probability of selecting green marble, putting it aside then selecting a red marble
3. Probability of selcting a yellow marble, followed by another yellow marble and an orange if after each pick the marbles we're put aside
Please explain your answer