A jar contains 6 black and 2 white balls. If you pick two balls at the same time, what's the probability that one ball is black and one is white?	Choose one:  A) 2 / 7  B) 5 / 7  C) 4 / 7  D) 3 / 15  E) 3 / 14

Rationale: "p ( 1 st black , 2 nd white ) = 6 / 8 * 2 / 7 = 12 / 56 ; p ( 1 st white , 2 nd black ) = 2 / 8 * 6 / 7 = 12 / 56 . p = 12 / 56 + 12 / 56 = 24 / 112 = 12 / 56 = 6 / 28 = 3 / 14 . answer : e ."
Answer: E