If the vectors bara=overset(^)i+overset(...

If the vectors `bara=overset(^)i+overset(^)j+overset(^)k,barb=overset(^)i-overset(^)j-2overset(^)k and barc=xoverset(^)i+(x-2)overset(^)j-overset(^)k` are coplanar, then `x=`

A

1

B

2

C

0

D

`-2`

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Verified by Experts

The correct Answer is:

D

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