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 choices
A) 7/19	B) 7/18	C) 7/12	D) 7/19	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 ⁸C₂ ways.   P = 7C2/`5C2 + 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