1.

If Delta=|{:(a_(1),b_(1),c_(1)),(a_(2),b_(2),c_(2)),(a_(3),b_(3),c_(3)):}| then |{:(A_(1),A_(2),A_(3)),(B_(1),B_(2),B_(3)),(C_(1),C_(2),C_(3)):}|=(A_(1),A_(2),A_(3) . . . . . " are cofactors of "a_(1),a_(2),a_(3) . . . . . )

Answer»

`(DELTA^(2))/(2)`
`2DELTA`
`Delta^(2)`
`Delta`

ANSWER :C


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