Question

Construa a matriz B=(bij)2×4 definida por
Bij= 1, se i=j
i+j, se i≠j​

Answer 1

`\left[\begin{array}{cccc}1&3&4&5\&3&1&5&6\end{array}\right]`

The only ones are on the "diagonal", where i = j. Else the position is simply the sum.