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For what values of lambda are the vector...

For what values of `lambda` are the vectors `vec(a) = 2 hat(i) + lambda hat(j) - hat(k) and vec(b) =4 hat(i) - 2 hat(j) -2 hat(k)` perpendicular to each other ?

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The correct Answer is:
`lambda = (5)/(2)`
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