Semiconductor Devices And Logic Gates

In a pure silicon, number of electrons and holes per unit volume are \(1.6 \times 10^{16} \mathrm{~m}^{-3}\). If silicon is doped with Boron in a way that on doping hole density increases to \(4 \times 10^{22} \mathrm{~m}^{-3}\). Then electron density in doped semiconductor will be