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 $0.85$
$E^-⟶ ??? ℎ????????\ ??\ ????$
$P(E^-) = 1 - P(E) = 1 - 0.85 = 0.15$
$\therefore P($not happening of rain$) = 0.15$

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