A bag contains 9 red, 2 green balls. 3 balls are drawn randomly. What is the probability that balls drawn contain exactly two green balls? Choose the correct choice.
A) 1/7  B) 2/9  C) 3/11  D) 3/55  E) 2/3
Total number of balls = 9+2= 
<gadget id="calculator">9+2</gadget>
<output>11</output>
11   n(S)= 11C3 = 11*10*9 / 3*2 = 165   n(E) = 2C2* 9C1 = 9   Probability = 9/165 = 3/55   Answer is 3/55
<result>D</result>
A bag contains 9 red, 2 green balls. 3 balls are drawn randomly. What is the probability that balls drawn contain exactly two green balls?