3.3.4 How to find average number of steps \(E\left ( T_{ij}\right ) \) between state \(i\) and state \(j\)?

\(regular:i\in R,j\in R\)	\(E\left ( T_{ij}\right ) =1+{\displaystyle \sum \limits _{k\neq j}} p_{ik}E\left ( T_{kj}\right ) \) if \(i=j\) then \(E\left ( T_{ij}\right ) =\frac {1}{w_{jj}}\) where \(w\) is the stationary probability vector
\(i\in T,j\in T\)	does not make sense to ask this here?