A bag contains 10 green and 8 white balls. If two balls are drawn simultaneously, the probability that both are of the same colour is  Answers.
A) 8/15
B) 21/44
C) 3/5
D) 11/15
E) 7/15
Drawing two balls of same color from ten green balls can be done in 10C₂ ways.   Similarly from eight white balls two can be drawn in ⁸C₂ ways.   P = 10C₂/¹⁵C₂ + ⁸C₂/¹⁵C₂ = 21/44   ANSWER:21/44
<result>B</result>
A bag contains 10 green and 8 white balls. If two balls are drawn simultaneously, the probability that both are of the same colour is