The answers are incorrect. They don’t explain why neuron exists. Neutrons will decay into protons after 15 minutes. If you put a neutron into a nucleus, then it will be able to occupy lower energy levels and interact with the rest of the nucleus by the strong force. Now, it can’t decay into a proton because that would require going into a higher enegry shell and overcoming electric repulsion. For other quarks, this effect is too small to overcome the bigger mass difference.
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