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JAMB Mathematics 2018 Paper

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Question : 12

Total: 62

The probabilities that John and James pass an examination are

\frac{3}{4}

\frac{3}{5}

respectively. Find the probability of both boys failing the examination.

$\frac{1}{10}$
$\frac{2}{10}$
$\frac{9}{20}$
$\frac{11}{20}$

Solution:

Pr(both John and James passed)

= $\frac{3}{4}$ x $\frac{3}{5}$

= $\frac{9}{20}$

Pr(john and james failed)= 1- Pr(john and james passed)

= 1 – $\frac{9}{20}$

= $\frac{11}{20}$

Answer is D

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