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JAMB Mathematics 2015 Paper

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Question : 32

Total: 61

The probability of an event A is 1/5. The probability of B is 1/3 . The probability both A and B is 1/15. What is the probability of either event A or B or both

$\frac{2}{15}$
$\frac{3}{4}$
$\frac{9}{15}$
$\frac{1}{15}$

Solution:

In probability, or = +

Prob( A or B or Both ) = $\frac{1}{3} + \frac{1}{5} + \frac{1}{15}$ = $\frac{5+ 3 + 1}{15}$ = $\frac{9}{15}$ = $\frac{3}{5}$

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