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if `a_(ij)` is the element in the ith row and jth column of a 3rd order determinant whose value is 1 and `c_(ij)` is the cofactor of `a_(ij)` then what is value of `a_11(c_11+c_21)+a_12(c_12+c_22)+a_13(c_13+c_23)`?

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