A bag contains 7 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 from the following choices:
A) 1/7	B) 2/9	C) 1/12	D) 4/17	E) 2/3
Total number of balls = 7+2= 
<gadget id="calculator">7+2</gadget>
<output>9</output>
9   n(S)= 91/123 = 9*8*7 / 3*2 = 84   n(E) = 21/122* 71/121 = 7   Probability = 7/84 = 1/12   Answer is 1/12
<result>C</result>
A bag contains 7 red, 2 green balls. 3 balls are drawn randomly. What is the probability that balls drawn contain exactly two green balls?