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Let vecu be a vector coplanar with the v...

Let `vecu` be a vector coplanar with the vectors `veca = 2hati + 3hatj - hatk` and `vecb = hatj +hatk`. If `vecu` is perpendicular to `veca` and `vecu.vecb=24`, then `|vecu|^(2)` is equal to

A

336

B

315

C

256

D

84

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The correct Answer is:
A
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