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The number of distinct real values of l, for which the vectors - λ^2i + j + k, i - λ^2j + k and i + j - λ^2k

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The number of distinct real values of l, for which the vectors - λ2i + j + k, i - λ2j + k and i + j - λ2k  are coplanar, is 

(A) zero 

(B) one 

(C) two 

(D) three

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Answer is (C) two

If the vectors are coplanar

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