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The value of lamda so that unit vectors ...

The value of `lamda` so that unit vectors` (2hati+lamdahatj+hatk)/(sqrt(5+lamda^2)) and (hati-2hatj+3hatk)/sqrt(14)` are orthogonl (A) `3/7` (B) `5/2` (C) `2/5` (D) `2/7`

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