Multiplication of two matrices possible if the number of columns in the

first matrix equals the number of rows in the second matrix.

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The dimensions of the matrix A are  and the number of the columns in

the matrix A is 3.

The dimensions of the matrix B are and the number of the rows in the

 matrix B is 3.

The number of columns in the matrix A equals the number of rows in

the matrix B.

So, matrix product AB is possible. Its dimensions are .

The matrix product AB is defined and matrix AB dimensions are .