If $\frac{2}{11}$ is the probability of an event, what is the probability of the event not $A$ ?

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Solution

Probability of event $A = \frac{2}{11}$
Probability of event A + Probability of event not A $= 1$
$\frac{2}{11}$ + Probability of event not A $= 1$
Probability of event not A $= 1 - \frac{2}{11}$
Probability of event not A $= \frac{9}{11}$
Hence probability of event not A $= \frac{9}{11}$

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