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      Question

      A bag contains 5 pink balls, 10 grey balls, and 3 brown

      balls. Two balls are drawn at random. Find the probability that the two balls are grey.
      A 11/51 Correct Answer Incorrect Answer
      B 5/17 Correct Answer Incorrect Answer
      C 20/153 Correct Answer Incorrect Answer
      D 5/51 Correct Answer Incorrect Answer
      E 10/51 Correct Answer Incorrect Answer

      Solution

      Number of ways of selecting two grey balls = 10 Cβ‚‚
      Total number of balls = 5 + 10 + 3 = 18
      Number of ways of selecting two balls = 18Cβ‚‚
      Probability = 10 Cβ‚‚ Γ· 18 Cβ‚‚ = (10 Γ— 9) Γ· (18 Γ— 17) = 90 Γ· 306 = 5/17

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