Increase in doping concentrations resulting in a decrease in mobility?

1. The problem statement, all variables and given/known data
So in one of our practice problems it states that as we increase the doping concentrations, the result will be a decrease in mobility.

However, I thought that when you increase doping concentrations, there will be a higher concentration of carriers available for conduction and thus the conductivity increases. So this should result in an increase in mobility? Also, when they say doping concentrations, it can either be p or n type dopants right?

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