Chapter 21, Problem 8PE

What is the coordination number of the metal ion in (a) $\left[{\text{PrCl}}_{\text{2}}{\left({\text{NH}}_{\text{3}}\right)}_{\text{2}}\right]$ and (b) ${\left[\text{Ag}{\left({\text{S}}_{\text{2}}{\text{O}}_{\text{3}}\right)}_{\text{2}}\right]}^{\text{3-}}$

What are the coordination geometries for the complexes?