The unit vector parallel to the resultan...

The unit vector parallel to the resultant of the vectors `hati+hatj-hatk " "" and"" " hati-2hatj+hatk`is

A

`(2 hati - hatj + hatk)/(sqrt5)`

B

`(2 hati - hatj)/(sqrt5)`

C

`(hati - hatj + hatk)/(sqrt5)`

D

`(2 hati + hatj)/(sqrt5)`

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