Claim:Pr(S ∖ E) = 1 - Pr(E)

From CS2800 wiki
If Pr is a probability measure on S, then for all events [math]E [/math], [math]\href{/cs2800/wiki/index.php/Pr}{Pr}(S \href{/cs2800/wiki/index.php/%E2%88%96}{∖} E) = 1 - \href{/cs2800/wiki/index.php/Pr}{Pr}(E) [/math]