ISRO Electrical Engineering (EE) 2013 - Question 77

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An urn contains 5 black and 5 white balls. The probability of drawing two balls of the same colour

  • A. 2/9
  • B. 4/9
  • C. 1/9
  • D. 5/9

Answer: B. 4/9

Explanation: P(same colour) = P(2 Black) + P(2 White) = (5/10 × 4/9) + (5/10 × 4/9) = 20/90 + 20/90 = 40/90 = 4/9.

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