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Find the value of λ such that the vectors (a) = 2i + λj + k and vector (b) = i + 2j + 3k are orthogonal

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Find the value of λ such that the vectors (a) = 2i + λj + k and vector (b) = i + 2j + 3k are orthogonal

(A) 0 

(B) 1 

(C) 3/2 

(D) –5/2

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Answer is (D)

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