If A= pmatrix 1&2 2&3 3&4 pmatrix and B= pmatrix 1&2 2&1 pmatrix , then which one of the following is correct?

NDA 2019 Mathematics question

If and , then which one of the following is correct?

Answer: (C)

A is and B is . AB exists because A has 2 columns and B has 2 rows

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Question ID VK-029077