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The probability of an event P happening is frac... - WAEC Mathematics 2014 Question

The probability of an event P happening is \(\frac{1}{5}\) and that of event Q is \(\frac{1}{4}\). If the events are independent, what is the probability that neither of them happens?
A
\(\frac{4}{5}\)
B
\(\frac{3}{4}\)
C
\(\frac{3}{5}\)
D
\(\frac{1}{20}\)
correct option: c

prob(p) = (\frac{1}{5})

prob(Q) = (\frac{1}{4})

Prob(neither p) = 1 - (\frac{1}{5})

(\frac{5 - 1}{5} = \frac{4}{5})

prob(neither Q) = 1 - (\frac{1}{4})

(\frac{4 - 1}{4} = \frac{3}{4})

prob(neither of them) = (\frac{4}{5} \times \frac{3}{4} = \frac{12}{20})

= (\frac{3}{5})

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