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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The ratio is 1 : 3.
because there is no factor for 1 and zero
4 doesn't belong because it's an even number.
You need two sets to have an intersection. If you have two sets, call them R and S, then their intersection is the set T that contains all elements of R that also belong to S OR all elements of S and also belong to R...it's the same thing.
the answer is -1