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If the vectors ahati+hatj+hatk,hati+bhat...

If the vectors `ahati+hatj+hatk,hati+bhatj+hatk and hati+hatj+chatk` are coplanar `(a ne b ne c ne 1)` , then the value of `abc - (a+b+c) =`

A

2

B

`-2`

C

0

D

`-1`

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The correct Answer is:
B
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