JAMB - Mathematics (2015 - No. 32)
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
\( \frac{2}{15} \)
\( \frac{3}{4} \)
\( \frac{9}{15} \)
\( \frac{1}{15} \)
คำอธิบาย
In probability, or = +
Prob( A or B or Both ) = \(\frac{1}{3} + \frac{1}{5} + \frac{1}{15}\) = \(\frac{5+ 3 + 1}{15}\) = \(\frac{9}{15}\) = \(\frac{3}{5}\)