A bag contains 3 red, 5 yellow and 4 green balls. 3 balls are drawn randomly. What is the probability that balls drawn contain exactly two green balls? Answers:  A) 9/16  B) 7/18  C) 12/55  D) 14/67  E) 19/87
Total number of balls = 3+5+4= 
<gadget id="calculator">3+5+4</gadget>
<output>12</output>
12   n(S)= 1212/553 = 12*11*10 / 3*2 = 220   n(E) = 412/552* 812/551 = 6*8= 
<gadget id="calculator">6*8</gadget>
<output>48</output>
48   Probability= 48/220 = 12/55   Answer is 12/55
<result>C</result>
A bag contains 3 red, 5 yellow and 4 green balls. 3 balls are drawn randomly. What is the probability that balls drawn contain exactly two green balls?