A box contains 2 white and 3 blue identical balls. If two balls are picked
MATHEMATICS
WAEC 2019
A box contains 2 white and 3 blue identical balls. If two balls are picked at random from the box, one after the other with replacement, what is the probability that they are of different colours?
- A. \(\frac{2}{3}\)
- B. \(\frac{3}{5}\)
- C. \(\frac{7}{20}\)
- D. \(\frac{12}{25}\)
Correct Answer: D. \(\frac{12}{25}\)
Explanation
(\(\frac{2}{5} \times \frac {3}{5}) + (\frac{3}{5} \times \frac{2}{5})\)
\(\frac{6}{25} + \frac{6}{25} = \frac{12}{25}\)
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