A bag contains 6 red marbles, 4 blue marbles, 7 green marbles, and 3 yellow marbles. A marble is drawn from the bag and is not replaced. Then a second marble is drawn. So, I need to figure out the probability that both marbles drawn were yellow...how do I do this?

Question

anonymous · Answer

How many yellow marbles are there? How many marbles are there in total?

anonymous · Answer

3 yellow, and 20 total

anonymous · Answer

So the odds of the first yellow is 3/20. The marble is not replaced. How many marbles would there be total? How many yellows?

anonymous · Answer

After the marble is not replaced? there is 19 total marbles, assuming it was yellow there is 2 yellow and still 19 total. 2/19

anonymous · Answer

Correct. Now you must multiply the 2 odds together. so 3/20*2/19. What do you  get?

anonymous · Answer

|dw:1430241674232:dw| So 3/190 are your odds.