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The main subgroup is the rational numbers. The set of irrational numbers is not closed with regard to addition basic arithmetical operations and so does not form a group.

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Q: How real numbers are divided into subgroups?
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What are the numbers that can be divided by 5?

All real numbers can be divided by 5.


What subgroups is the universe divided into?

time, space, and mater


What is the different type of real number?

The real numbers are divided into rational numbers and irrational numbers.


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A sample of a population that has been divided into subgroups?

Prussia was divided into Poland and other German/Russian inhabitants living in that area around the end of WWII times