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Find λ, when the projection of vector a = λi + j + 4k on vector b = 2i + 6j + 3k is 5 units.

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Find λ, when the projection of vector a = λi + j + 4k on vector b = 2i + 6j + 3k is 5 units.

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2λ = 28 - 18 = 10

λ = 10/2 = 5

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