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JAMB Mathematics 2005 Question 49

Question 49

Probability

A box contains 5 blue balls, 3 red balls and 2 white balls. Two balls are selected from the box with replacement. Find the probability of obtaining two blue or two red balls.

  1. A.17/50
  2. B.3/25
  3. C.1/50
  4. D.3/250
Show the answer and explanation

Answer: A (17/50)

Explanation

P(two blue) = (5/10)2 = 1/4 and P(two red) = (3/10)2 = 9/100. Total = 25/100 + 9/100 = 34/100 = 17/50.