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Let veca= 4i + 5j-k, vecb = i - 4j + 5k ...

Let `veca= 4i + 5j-k, vecb = i - 4j + 5k` and `vecc = 3i + j-k.` Find the vector which perpendicular to both `a` and `b` whose magnitude is twenty one times the magnitude of `C`

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