Let A=[a(ij)](nxxn) be a square matrix o...

Let `A=[a_(ij)]_(nxxn)` be a square matrix of order 3 such that |A|=-7 and let `c_(ij)` be cofactor of `a_(ij)` in A. then `underset(i=1)overset(3)sum a_(i2)A_(i2) ` equal

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