A bag contains 7 black and 8 white balls. If two balls are drawn simultaneously, what is the probability that both are of the same color is?	Choose the correct choice from the following answers.
A) 1/2	B) 1/3	C) 2/3	D) 3/5	E) 7/15
Drawing two balls of same color from seven black balls can be done in ⁷C₂ ways.   Similarly from eight white balls two can be drawn in ⁸C₂ ways.   P = ⁷C₂/¹⁵C₂ + ⁸C₂/¹⁵C₂ = 7/15   Answer is 7/15
<result>E</result>
A bag contains 7 black and 8 white balls. If two balls are drawn simultaneously, what is the probability that both are of the same color is?