The probabilities that John and James pass an examination are \(\frac {3}{4}\)and \(\frac {3}{5}\) respectively. Find the probability of both boys failing the examination.
- \(\frac {1}{10}\)
- \(\frac {2}{10}\)
- \(\frac {9}{20}\)
-
\(\frac {11}{20}\)
The correct answer is: D
Explanation
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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