Let $P(3,2,6)$ be a point in the space and Q be a point on the line $\overrightarrow{r} =(\hat i - \hat j +2 \hat k) +\mu (-3 \hat i +\hat j +5 \hat k ),$ then find the value of $\mu$ for ehich the vector $\overrightarrow{PQ}$ is parallel to the plane $x -4y+3z=1$

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