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WAEC Further Mathematics 2020 Question 34

Question 34

Probability

A bag contains 5 red and 5 blue identical balls. Three balls are selected at random without replacement. Determine the probability of selecting balls alternating in color.

  1. A.7/18
  2. B.5/18
  3. C.5/36
  4. D.1/36
Show the answer and explanation

Answer: B (5/18)

Explanation

RBR: (5/10)(5/9)(4/8) = 100/720; BRB is the same. Total 200/720 = 5/18.