Three coplanar vector in arbitary units ...

Three coplanar vector in arbitary units are given `vecA=4hati+2hatj-3hatk,vecB=hati+hatj+3hatkand vecC=4hati+5hatj+3hatk,` the resultant is

A

`8hati+3hatj+3hatk`

B

`5hati+3hatj-3hatk`

C

`9hati+3hatj+12hatk`

D

`9hati+8hatj+3hatk`

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The correct Answer is:

D

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