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 option: A) 1 / 2 B) 1 / 3 C) 2 / 3 D) 3 / 5 E) 7 / 15

Rationale: drawing two balls of same color from seven black balls can be done in ⁷ c ₂ ways . similarly from eight white balls two can be drawn in ⁸ c ₂ ways . p = ⁷ c ₂ / ¹ ⁵ c ₂ + ⁸ c ₂ / ¹ ⁵ c ₂ = 7 / 15 answer is e
Answer: E