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

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

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=> 2λ = 28 - 18 = 10

. .. λ = 5 unit

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