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There are infinite number of sets:

Integers, positive integers, rationals, reals, {1,2,3}, {1, 2.35, sqrt(-7), -one quintillion}

Numbers that are neither prime nor composite.

Multiplicative identities in mathematical groups.

Numbers whose name, in English, begins with the letter O.

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13y ago
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Q: Which group of sets does the number 1 belong to?
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