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If the vectors vector a = i - j + 2k, vector b = 2i + 4j + 4k and vector c = λi + j + μk are mutually orthogonal,

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If the vectors vector a = i - j + 2k, vector b = 2i + 4j + 4k and vector c = λi + j + μk are mutually orthogonal, then (λ, μ) =
(a) (–3, 2) 

(b) (2, –3)

(c) (–2, 3) 

(d) (3, –2)

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