If $E$ and $F$ are events such that $P ( E )=\frac{1}{4}$, $P ( F )=\frac{1}{2}$ and $P(E$ and $F )=\frac{1}{8},$ find : $P ( E$ or  $F )$

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Here, $P ( E )=\frac{1}{4}$,  $P ( F )=\frac{1}{2},$ and  $P ( E$ and $F )=\frac{1}{8}$

We know that $P ( E$ and $F )= P ( E )+ P ( F )- P ( E$ and  $F )$

$\therefore P(E $ or  $F)=\frac{1}{4}+\frac{1}{2}-\frac{1}{8}$ $=\frac{2+4-1}{8}=\frac{5}{8}$

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