The number 8 goes in infinitely many sets of numbers.
Most notably:
8 is a "Natural number" (a number you can use when counting objects)
8 is a "Composite number" (a number that isn't prime)
8 is an "Even number" (a number that can divide by 2 without a remainder)
8 is a "Fibonacci number" (a number in the sequence where each number equals the sum of the two preceding numbers, beginning at 1,1)
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Three sets
No. Complex numbers is the highest set of numbers you can go, and there are no sets outside of complex numbers.
No, because there are an infiite number of sets that contain -5. For example {-5, 8}, which does not even have a name.
If I'm not wrong, sets of numbers are groups of numbers, pairs of numbers, but meant to be together in a certain order, way. When you say, take a set of numbers, 2, 4, 6, 8, 10... You took a group of numbers that are all even numbers. I guess its that, but Im not sure. Hope I helped in some way :)
There are two sets of 3 consecutive numbers whose sum is 30 but neither set contains all odd numbers. The two sets are: 8, 10 and 12 as well as 9, 10 and 11.