A bag contains 7 green and 8 white balls. If two balls are drawn simultaneously, the probability that both are of the same colour is -.
Choose one.
A) 7/18 B) 7/19 C) 7/11 D) 7/12 E) 7/15
Drawing two balls of same color from seven green balls can be done in ⁷C₂ ways.   Similarly from eight white balls two can be drawn in ways.   7/15   Answer: 7/15
<result>E</result>
A bag contains 7 green and 8 white balls. If two balls are drawn simultaneously, the probability that both are of the same colour is -.