The intrinsic carrier density in germanium crystal at 300 K is `2.5xx10^(13)` per `cm^(3)` if the electron density in an N-type germanium crystal at 300 K be `0.5xx10^(17)` per `cm^(3)` the hle density (per `cm^(3)`) in this N-type crystal at 300 K would be expected around-