Matrix Multiplication Row-Column Rule
When you multiply two matrices, $A$ and $B$, and only want one entry($ij$) in the result matrice $C$, we can use the formula:
$$ C_{ij} = A_{i1}B_{1j} + A_{i2}B_{2j} + A_{i3}B_{3j} + … + A_{in}B_{nj} $$
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When you multiply two matrices, $A$ and $B$, and only want one entry($ij$) in the result matrice $C$, we can use the formula:
$$ C_{ij} = A_{i1}B_{1j} + A_{i2}B_{2j} + A_{i3}B_{3j} + … + A_{in}B_{nj} $$