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** Q 1135301262. ** Let `P(3, 2, 6)` be a point in space and `Q` be a point on the line `vecr=(i-j+2k)+mu(-3i+j+5k).` Then the value of `mu` for which the vector `vec(PQ)` is parallel to the plane `x-4y+3z=1` is

**JEE 2009 **