What do you mean by Pauli’e exclusive principle? What is its significance?

What do you mean by Pauli’e exclusive principle? What is its significance?
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Ans No two electrons will have same set of all q.no. If n,l,m are same i.e. same orbital ‘s’ will be differ. It shows that all electrons have a definite place in an atom or their own identity.
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A man wanted to enter an exclusive club but did not know the password that was required. He waited by the door and listened. A club member knocked on the door and the doorman said, 'twelve.' The member replied, 'six ' and was let in. A second member came to the door and the doorman said, 'six.' The member replied, 'three' and was let in. The man thought he had heard enough and walked up to the door. The doorman said ,'ten' and the man replied, 'five.' But he was not let in. What should have he said? -Riddles

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