Which of the following is the correct definition of a perfect number?

Options :
  1. A number such that the sum of its factors, excluding itself, is greater than itself.
  2. A number such that its only divisors are 1 and itself.
  3. A number such that the sum of its factors, excluding itself, equals itself.
  4. A number such that it cannot be expressed as the ratio of two integers.
Answer and Explanation :-

Answer: Option 3


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