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A unit vector perpendicular to the plane...

A unit vector perpendicular to the plane containing the vectors `hati+2hatj+hatk and -2hati+hatj+3hatk` is

A

1)`(-hati+hatj+hatk)/sqrt3`

B

2)`(hati-hatj+hatk)/sqrt3`

C

3)`(-hati-hatj-hatk)/sqrt3`

D

4)`(hati+hatj-hatk)/sqrt3`

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The correct Answer is:
A
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