Assume that the ( S ) ( S ; alphabet ) is the solubility in mol/L of AB2 compound , , then what is the concentration of A and B ? and what is the Ksp of AB2 compound ?

thank you a lot

...........AB2 ==> A^2+ + 2B^-

I..........solid...0.......0
C..........solid...s.......2s
E..........solid...s.......2s

Ksp = (A^2+)(B^-)^2
Ksp = (S)(2S)^2
Ksp = 4S^3