The number 0.12123123412345 belongs to the set of real numbers, specifically as a decimal representation of a rational number if it can be expressed as a fraction. Additionally, it can be classified as an irrational number if it does not terminate or repeat, but in this case, it appears to terminate after a certain point, suggesting it is likely a rational number. Thus, its set of belonging includes rational numbers, real numbers, and decimal numbers.
Irrational numbers.
mixed numbers
Negative numbers belong to the set of integers, which includes all whole numbers and their negative counterparts. They are also part of the set of rational numbers, as they can be expressed as fractions. Additionally, negative numbers are included in the set of real numbers, which encompasses all rational and irrational numbers.
composite
Rational positive numbers
The set of numbers which 3 does not belong is the set of even numbers.
10 belongs to the set "natural numbers", but it can also belong to whole numbers, and rational numbers
Counting numbers
Irrational numbers.
The set of even numbers
It belongs to the set of prime numbers
rational and prime numbers
Rational and Real numbers
mixed numbers
odd numbers, perfect square numbers
Integers
composite