If the vectors aoverset(^)i+overset(^)j+...

If the vectors `aoverset(^)i+overset(^)j+overset(^)k,overset(^)i+boverset(^)j+overset(^)k and overset(^)i+overset(^)j+coverset(^)k` are coplanar `(a ne b ne c ne 1)`, then the value of `abc-(a+b+c)=`

`-2`

`-1`

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