1) AgCN; 5.97 x 10¯¹⁷

2) Zn₃(AsO₄)₂; 3.12 x 10¯²⁸

3) Hg₂I₂; 5.33 x 10¯²⁹

The values given are the K_sp values from a reference source. Due to rounding, the K_sp value you calculate will be slightly different, but it should be close.