A bag contains 4 purple. 6 green, and 9 blue marbles And Reach into the box and pull out 4 marbles at random what\'s the probability that 2 of 4 marbles that you chose are white? Solution Total=4+6+9=19 So the probability is (2C4)*(2C15)/4C19 =(4*3/2)*(15*14/2)/(19*18*17*16/(1*2*3*4)) =0.1625387.