1.

Let bara,barb and barc are three mutually perpendicular unit vectors and a unit vector barr satisfying the equation (barb times barc) times (barr times bara)+(barc times bara) times (barr times barb)+(bara-barb) times (barr -barc)=0 then barr is

Answer»

`1/sqrt3(bara+barb+barc)`
`-1/sqrt14(2bara+3barb+barc)`
`1/sqrt14(2bara+3barb+barc)`
`-1/sqrt3(bara+barb+barc)`

ANSWER :A::D


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