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A bag contains 5 black and 4 white balls. A man selects two balls at random. What is the probability that both of these are of the same colour?

Options

  1. A1 6
  2. B5 108
  3. C4 9
  4. D5 18

Correct answer

C. 4 9

Step-by-step solution

Required probability aligned p( E ) & = ^5 C ₂+ ^4 C ₂ ^9 C ₂ = 5 4 2 + 4 3 2 9 8 2 & = 10+6 36 = 16 36 = 4 9 aligned

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