Every number is unique, because if any number weren't unique, it would be exactly the same as another number, so the number that wasn't unique was just another way to write a different number.
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Ordinal numbers are defined as the way that numbers are ordered in a set of numbers. For example: 1; 2; 3. Examples can be found at the Maths Can Be Fun website.
In maths
Mr.carl f gauss toldmaths is queen of science and theory of numbers is queen of maths
There is no end to the numbers of maths and there are many classifications of numbers, like primes, fractions, even, odd, positive, negative and others.
The mean is usually the arithmetic mean - there are other means in maths. For a set of numbers, the arithmetic mean is the sum of the numbers divided by the number of numbers.