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What is the formula to calculate the element present in second row, first column of the product matrix?

What is the formula to calculate the element present in second row, first column of the product matrix? Correct Answer M2+M4

The element at second row, first column can be found by the formula M2 + M4, where M2 and M4 can be calculated by M2= (A(2,1) + A(2,2)) B(1,1) M4=A(2,2)(B(1,2) – B(1,1)).

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