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Who is right about "Thirteen" and "Thirteen" in mathematics?
There is no right or wrong, just a habit difference.

It is more convenient to say "thirteen" than thirteen, but the meaning is exactly the same.

If we say "1 10 people", it is strictly 1 10 people, but sometimes it is also called "100 people", that is to say, this phenomenon only appears when the number of people is 1.

The normative expression is "13", and "13" is just a idiom.