Diode and doping on N and P regions

Dear forum,

in a diode semiconductor, the N region is rich in electrons. The P region is rich in holes.

Is the number of extra electrons in the N region equal, larger or smaller than the number of holes in the P region? If so, why?


Also, in the N region, it is said that the majority carriers are the electrons. I get that. The minority carriers are the holes....but there are no holes in the N region so how can there be any minority carriers at all?


Thanks,
fisico30