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Complement of an Event

PE + PNot E=...

Question

$P (E) + P (Not E) =$ _____.

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Solution

If $p$ is the probability of an event happening, then the probability that the event does not happen will be $1 - p$ .
$∴ P (E) + P ($ Not $E) = p + (1 - p) = 1$

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