Co-ordination number of Fe in the complexes ${\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]}^{4-},{\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]}^{3-}$ and ${\left[{\mathrm{FeCl}}_4\right]}^{-}$ would be respectively

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