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 the correct choice from the following.
A) 7/19	B) 7/11	C) 7/10	D) 7/21	E) 7/15
Explanation:   Drawing two balls of same color from seven green balls can be done in ways.   Similarly from eight white balls two can be drawn in ways.   P = 7C2/15C2 + 8C2/15C2 = 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