Question

suppose that B is a matrix whose third column is sum of the first two columns then the third column of AB is
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Answer 1

Step-by-step explanation:

B is a matrix and third column of B is sum of the first two columns. We know that, ... So, we can say that the matrix's rows AB are all linear combination of the rows of B which is satisfies this lines relation. So, column third is the same combination of previous two columns of AB