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The vector a, b, c are equal in length a...

The vector a, b, c are equal in length and taken pairwise they mak equal-angles.
If `a=i+j, b=j+k` and c makes obtuse angle with x-axis, then c =

A

`-hati+4hatj-hatk`

B

`hati+hatk`

C

`1/(3) (-hati+4hatj-hatk)`

D

`(hati-4hatj+hatk)/3`

Text Solution

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The correct Answer is:
C
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