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If 3hati+2hatj+8hatk and 2hati+xhatj+hat...

If `3hati+2hatj+8hatk and 2hati+xhatj+hatk` are at right angles then x =

A

7

B

`-7`

C

5

D

`-4`

Text Solution

Verified by Experts

The correct Answer is:
B
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