[math] \newcommand{\NA}{{\rm NA}} \newcommand{\mat}[1]{{\bf#1}} \newcommand{\exref}[1]{\ref{##1}} \newcommand{\secstoprocess}{\all} \newcommand{\NA}{{\rm NA}} \newcommand{\mathds}{\mathbb}[/math]

In Example, find [math]\mat{P}[/math], [math] \mat {P}^2,[/math]and [math] \mat {P}^3.[/math] What is [math] \mat {P}^n[/math]?