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Given vec alpha=3hati+hatj+2hatk and vec...

Given `vec alpha=3hati+hatj+2hatk and vec beta=hati-2hatj-4hatk` are the position vectors of the points `A and B` Then the distance of the point `hati+hatj+hatk` from the plane passing through `B` and perpendicular to `AB` is (a) `5` (b) `10` (c)`15` (d) `20`

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