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If numbers may be repeated . . . 36 If numbers may not be repeated . . . 30 If the sequence doesn't matter . . . 15
It is an ordered set of elements. These elements may or may not be numbers, there may or may not be a defining rule - for example a sequence of random numbers.
Fractions are not integers. They may or may not be rational numbers.
The concept of a set of numbers is very simple: it is simply a collection of numbers. That is all it is. The set may contain infinitely many numbers, or just a finite lot of them, even one or none. The numbers in the set may have some relationship with one others in the set or they may be no such relationship.
No. Scientific numbers are constants that appear in science. They may or may not require scientific notation.