Question
The probability that it will rain tomorrow is $0.85$. What is the probability that it will not rain tomorrow?

Answer

Let $E$ be the event of happening of rain
$P ( E )$ is given as $0.85$
$E^{-} \longrightarrow ? ? ? h ? ? ? ? ? ? ? ? ? ? ? ? ? ? \\
P\left(E^{-}\right)=1-P(E)=1-0.85=0.15$
$\therefore P$ (not happening of rain) $=0.15$

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