1.

If 4bar(a)+5bar(b)+9bar( c )=0 then (bar(a)xx bar(b))xx[(bar(b)xx bar( c ))xx(bar( c )xx bar(a))] = ………..

Answer»

Perpendicular vector to the PLANE `BAR(a),bar(b)` and `bar( C )`
Scalar QUANTITY
`bar(0)`
None of these

Answer :C


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