A bag contains 3 red, 2 yellow and 4 green balls. 3 balls are drawn randomly. What is the probability that the balls drawn contain balls of different colours?
Select the correct option: A) 2/7 B) 3/5 C) 3/11 D) 1/4 E) 7/16
Total number of balls = 3+2+4= 
<gadget id="calculator">3+2+4</gadget>
<output>9</output>
9   n(S)= 9C3 = 84   n(E) = 3C1 * 2C1 * 4C1 = 3*2* 4= 
<gadget id="calculator">3*2* 4</gadget>
<output>24</output>
24   Probability= 24/84 = 2/7   2/7nswer is 2/7
<result>A</result>
A bag contains 3 red, 2 yellow and 4 green balls. 3 balls are drawn randomly. What is the probability that the balls drawn contain balls of different colours?