For $d^6$ configuration, high spin

(i) In case of octahedral complex $tg{g}^{2.1.1},{\mathrm{e}}_g^{1.1}$

$\mathrm{CFSE}=\left[-0.4{\mathrm{nt}}_{2g}+0.6{\mathrm{n}}_{\mathrm{eg}}\right]{\Delta }_0+\mathrm{n}\left(\mathrm{P}\right)$

$=[-0.4\times 4+0.6\times 2]{\Delta }_0+0$

$=-0.4\Delta 0$

(i) In case of tetrahedral complex ${\mathrm{e}}^{2,1},{\mathrm{t}}_2^{1,1,1}$

$\mathrm{CFSE}=\left[-0.6{\mathrm{n}}_e+0.4{\mathrm{nt}}_2\right]\Delta \mathrm{r}$

$=[-0.6\times 3+0.4\times 3]{\Delta }_t$

$=-0.6{\Delta }_t$