MO412A - Leticia Marques

We have that \( N_{ij}^{(d)} = A_{ij}^d \), so given the second-degree matrix  \( N_{ij}^{(2)} = A_{ij}^2 \): \[ A^2 = \left( \begin{array}{cccc} 1 & 0 & 1 & 1 \\ 0 & 3 & 1 & 1 \\ 1 & 1 & 2 & 1 \\ 1 & 1 & 1 & 2 \end{array} \right) \] Which one is the correct corresponding graph? a) b) c)  d)    e) None of the above Original idea by: Leticia Marques