We cannot multiply a 1 × m matrix by an n × m matrix.

Name: We cannot multiply a 1 × m matrix by an n × m matrix.
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Question

Quizplus · Accepted Answer

This is because the number of columns in the first matrix must match the number of rows in the second matrix for matrix multiplication to be defined. In this case, the first matrix has 1 column and the second matrix has m columns, which cannot be equal unless m=1, making the second matrix a 1 × 1 matrix (scalar).

We Cannot Multiply a 1 × M Matrix by an N