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WAEC Mathematics 2019 Paper

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Question : 33

Total: 50

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?

$\frac{2}{3}$
$\frac{3}{5}$
$\frac{7}{20}$
$\frac{12}{25}$

Solution:

( $\frac{2}{5} \times \frac{3}{5}) + \left(\frac{3}{5} \times \frac{2}{5}\right)$

$\frac{6}{25} + \frac{6}{25} = \frac{12}{25}$

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