${\mathrm{\lambda }}_{\mathrm{m}}^0\left({\mathrm{AgNO}}_3\right), {\mathrm{\lambda }}_{\mathrm{m}}^0\left(\mathrm{HCl}\right) \mathrm{and} {\mathrm{\lambda }}_{\mathrm{m}}^0\left({\mathrm{HNO}}_3\right)$ are a,b and c S ${\mathrm{cm}}^2{\mathrm{mol}}^{-1}$ respectively if the cnductivity of a saturated solution is Z S cm^-1. Then the soulbility of AgCl is