Answer
$\frac{1}{4}$
Work Step by Step
We know that,
$\frac{V1}{V2}=\frac{T1}{T2}\times\frac{P2}{P1}$
Since, $\frac{T1}{T2}=2$ and $\frac{P2}{P1}=2$,
$\frac{V1}{V2}=2\times2=4$
So, $\frac{V2}{V1}=\frac{1}{4}$
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