173 belongs to the set of positive natural numbers and it also belongs to the set of prime numbers.
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The difference of two sets A and B , to be denoted by A-B, is the set of all those elements which belong to A but not to B
-10 belongs to the set of all integers denoted by Z.
The intersection of two sets S and T is the set of all elements that belong to both S and T.
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.
There are an infinity of possible answers: the integers, rationals, reals, complex numbers, the set {0,1,-3}, the set containing only the element 0;