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If a(ij) is an element in ith row and jt...

If `a_(ij)` is an element in ith row and jth column of a 3rd order determinant and `c_(ij)` be the cofactor of `a_(ij)`, then what is the value of `a_(12)c_(12)-a_(21)c_(21)+a_(13)c_(13)-a_(31)c_(31)` ?

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