set of odd numbers divisible by 2 between 10 and 20
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50 is divisible by 1, 2, 5, 10, 25 and 50 in the set of whole numbers. In the set of real numbers, 50 is divisible by any number and the answer will be a whole number only if it is divided by the 6 numbers mentioned above.
The subset of counting numbers between 0 and 120, inclusive, that are even, divisible by 5, and the square of one of the counting numbers are 0 and 100.Zero is included in this answer because, as of around the 1900's, it was added to the set of counting numbers, said set originally starting with one.
Whole numbers, composite numbers, odd numbers, numbers divisible by 3, and many more.
For example the set of all numbers which are integer multiples of 4 is a subset of all the numbers exactly divisible by 2.
The odds of choosing a prime number in the set [1-20] are 8 out of 20, as there are 8 prime numbers, 2, 3, 5, 7, 11, 13, 17, and 19, in that set.