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If A = [aij] is is a matrix of order 2 x 2 such that |A| = -15, and Ci represents the cofactor of aij then find a21 c21 + a22 c22

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If A = [aij] is is a matrix of order 2 x 2 such that |A| = -15, and Ci represents the cofactor of aij then find a21 c21 + a22 c22

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a21 c21 + a22 c22 = |A| = -15

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