there are 39 whole numbers between 21 and 61
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There are no whole numbers between 20 and 21. Only fractions or decimals exist between these two numbers. Whole numbers between 20 and 25 are 21, 22, 23, and 24.
Infinitely many. In general, between ANY two DIFFERENT numbers, there are infinitely many other numbers.
Whole numbers are known as zero plus the "counting numbers." (1, 2, 3, ...) So, the whole numbers of 21 would be 0 - 21. (23 numbers.)
Four. The prime numbers between 10 and 21 are 11, 13, 17, and 19.
11 numbers:6, 9, 15, 21, 33, 39, 51, 57, 69, 87 and 93.