Matrix |
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An array of numbers is called a matrix. |

Figure 1. |
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Matrices can only be multiplied if the number of columns in the first matrix is equal to the number of the rows in the second matrix.

Figure 2. |
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Below, we are multiplying two 2 x 2 matrices:

Figure 3. |
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Now, we have our final result:

Figure 4. |
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