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Let \veca=\hati+2\hatj+3\hatk, \vecb=2\hati+3\hatj-5\hatk and \vecc=3\hati-\hatj+\lambda\hatk be three vectors. Let \vecr be a unit vector along \vecb+\vecc. If \vecr*\veca=3, then 3\lambda is equal to: | Watch the step-by-step video solution for this NIMCET PYQ.