Chapter 13.6, Problem 47PP

A saturated solution of silver carbonate, ${\text{Ag}}_2{\text{CO}}_3$ , has $\left[{\text{Ag}}^{+}\right]=2.6\times {10}^{-4}\text{M}$ and $\left[{\text{CO}}_3^{2-}\right]=1.3\times {10}^{-4}\text{M}$ . What is the numerical value of $K_{\text{sp }}$ for ${\text{Ag}}_2{\text{CO}}_3$ ?