Let bara=-overset(^)i-overset(^)k,barb=-...

Let `bara=-overset(^)i-overset(^)k,barb=-overset(^)i+overset(^)j and barc =overset(^)i+2overset(^)j+3overset(^)k` be three given vectors. If `barr` is a vector such that `barrxxbarb=barcxxbarb and barr. bara=0`, then the value of `barr.barb` is

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Let `bara=-overset(^)i-overset(^)k,barb=-overset(^)i+overset(^)j and barc =overset(^)i+2overset(^)j+3overset(^)k` be three given vectors. If `barr` is a vector such that `barrxxbarb=barcxxbarb and barr. bara=0`, then the value of `barr.barb` is

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