Hello guys can someone help me with that please ? And thanks for that
$A = \begin{bmatrix} 1 & 1 & 1 \\ 0 & 1 & 1 \\ 0 & 0 & 1 \end{bmatrix}, \tag 1$
and we have
$B = A − I. \tag 2$
Calculate $B^n$ for $n ∈ N$ and deduct from that the expression of $A^n$.