Molar solubility of a salt, AB2 is 3×10-6 M . Solubility product of the salt is

AB2s⇌A+2aq+2B-aq;                      s             2s Ksp=s2s2; Ksp=4s3; Ksp=43×10-63; Ksp=1.08×10-16 M3 ;