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Let vec a = lambda hat i + hat j + 4 hat...

Let `vec a = lambda hat i + hat j + 4 hat k` and `vec b = 2 hat i + 6 hat j + 3 hat k`. If the projection of `vec a` and `vec b` is 4 units, find `lambda`.

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The correct Answer is:
`therefore lambda = 5`
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