A bag contains 7 white, 6 red and 9 black balls. Two balls are drawn at random. The probability that both the balls will be black is
- A. 1/11
- B. 12/77
- C. 5/77
- D. 9/77
Answer: B. 12/77
Explanation: Total = 22. P(2 Black) = $^{9}C_2 / ^{22}C_2 = 36 / 231 = 12/77$.