The vector which can give unit vector-al...

The vector which can give unit vector-along-x-axis with `vecA=2hati-4hatj+7hatk, vecB=7hati+2hatj-5hatk and vecC=-4hati+7hatj+3hatk` is

A

`4hati+5hatj+5hatk`

B

`-5hati-5hatj+5hatk`

C

`-4hati-5hatj-5hatk`

D

`4hati-5hatj-5hatk`

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The correct Answer is:

C

The vector is `hati-(vecA+vecB+vecC)=-4hati-5hatj-5hatk`

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