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Let bara =4bari+5barj-bark, barb = bari ...

Let `bara =4bari+5barj-bark, barb = bari - 4barj+5bark and c= 3bari +barj-bark`. Find the vector which is perpendicular to both `bara and barb` whose magnitude is twenty one times the magnitude of `barc`.

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The correct Answer is:
`pm7sqrt(33)(veci-vecj-veck)`.
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