1.

If bar(a),bar(b) and bar( c ) are not coplanar then (bar(a)+bar(b)+bar( c ))*[(bar(a)+bar(b)) times (bar( a )+bar(c))] = ……………

Answer»

`[(BAR(a),bar(B),bar( C ))]`
`2[(bar(a),bar(b),bar( c ))]`
`-[(bar(a),bar(b),bar( c ))]`
`-2[(bar(a),bar(b),bar( c ))]`

ANSWER :B


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