a bag contains 5 blue marbles, 6 red marbles, and 9 green marbles. two marbles are drawn at random, one at a time and with out replacement. what is the probability of selecting two red marbles
Your answer would be d) 11/20 knowing that there are in total 6 red marbles and you don't replace it so it would be 6+5=11 and 9+6+5= 20 so it would leave you with 11/20
