Write finite difference formulation equations for the nodes $1\mathrm{.}2,3\mathrm{.}4.5$ and $6$ in the thermalshown below, set up the matrices and calculate temperatures for all nodes where thermal conductivity k$=45$ W$/$m $\backslash$deg C$)$ convection coefficient h$=50$ W$/$m$?\backslash$deg C; ambient Temperature T$-=20\backslash$deg C$.)100\backslash$deg C