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Find the value of lambda so that the three vectors are co-planar. (2,-1,1), (1,2,-3) and (3,λ,5)

Answer»

Solution :Let `VECA = (2,-1,1), vecb = (1,2,-3), vecc = (3,lambda,5)`
If `veca,vecb,vecc` are COPLANAR then `vecaxxvecb.vecc = 0`


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