Let the mirror image of the point \( (1,3, a) \) with respect to \(...

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Let the mirror image of the point \( (1,3, a) \) with respect to
\( P \) the plane \( \vec{r} \cdot(2 \hat{i}-\hat{j}+\hat{k})-b=0 \) be \( (-3,5,2) \).

W)
Then, the value of \( |a+b| \) is equal to
\[
\text { [JEE Main-2021 (March }]
\]
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