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If \veca=\lambda \hati+\hatj-2\hatk , \vecb=\hati+\lambda \hatj-2\hatk and \vecc=\hati+\hatj+\hatk and \beginbmatrix\veca & \vecb & \vecc \endbmatrix=7, then the values of the \lambda are | Watch the step-by-step video solution for this NIMCET PYQ.