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If the projection of 2i + 4j - 2k on i + 2j + αk is zero. Then, the value of α will be

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If the projection of \(2\hat{i}+4\hat{j}-2\hat{k}\) on \(\hat{i}+2\hat{j}+\alpha\hat{k}\) is zero. Then, the value of α will be

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Correct answer is 5

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