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Listing method of a natural number between 5 and 6

x = {      }   or empty set

Natural numbers are counting numbers.

May I add that between 5 and 6 are not natural numbers. They are called rational numbers :-) Between 5 and 6 are 5.5 or 5 and 1/2, 5.75, , etc.
thank you :)
You're welcome :-)