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Each question given below has four possi...

Each question given below has four possible answers, out of which only one is correct. Choose the correct one. `(2hati-4hatj).(hati+hatj+hatk)` = ______

A

`-3`

B

`+2`

C

`-1`

D

`-2`

Text Solution

Verified by Experts

The correct Answer is:
D
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