If the vectors bara = hati + hatj + hatk...

If the vectors `bara = hati + hatj + hatk, barb = hati - hatj +2hatk` and `barc = xhati + (x-2)hatj - hatk` are coplanar, then x =

A

1

B

2

C

0

D

-2

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The correct Answer is:

D

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