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JAMB Mathematics 2003 Question 48

Question 48

Probability

A bag contains 5 black balls and 3 red balls. Two balls are picked randomly without replacement. What is the probability that a black and a red ball are picked?

  1. A.15/28
  2. B.13/28
  3. C.5/14
  4. D.3/14
Show the answer and explanation

Answer: A (15/28)

Explanation

P = (5/8 × 3/7) + (3/8 × 5/7) = 15/56 + 15/56 = 15/28.