A box contains 2 white and 3 blue identical marbles. If two marbles are picked
MATHEMATICS
WAEC 1991
A box contains 2 white and 3 blue identical marbles. If two marbles are picked at random, one after the other without replacement, what is the probability of picking two marbles of different colors?
- A. 2/3
- B. 3/5
- C. 2/5
- D. 7/20
Correct Answer: B. 3/5
Explanation
Total number of marbles = 5; 1st pick = 2/5 2nd pick = 3/4; 3rd pick = 3/5; 4th pick = 2/4
? Probability of picking two marbles of different colors = (2/5 x 3/4) + (3/5 + 2/4) = 12/20 = 3/5
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