Answer
$\frac{193}{463}$
Work Step by Step
The odds for $E$: $\frac{P(E)}{P(\text{not E})}$. The probability for $E$: $\frac{P(E)}{P(\text{not E})+P(E)}$.
Hence here the probability is: $\frac{193}{270+193}=\frac{193}{463}$
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