Can you try running echo $PATH and see if that returns anything? On my raspberry pi it is returning
while ls PATH does return
ls: cannot access PATH: No such file or directory
If you try ls /home/pi/ABElectronics_python3_libraries/ADCPi does that go to the correct directory?
Also are you editing the .bashrc file in your home directory or in the root? In your first post you mentioned /.bashrc . It should be the file in your home directory ~/.bashrc that you need to edit which you can get to with
sudo nano ~/.bashrc