Oh, what a lovely question! Between 13 and 39, there are 25 numbers. You can find them by subtracting 13 from 39 and then subtracting 1 to exclude the numbers 13 and 39 themselves. Remember, math is just like painting - with a little patience and practice, you can create something beautiful!
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there are 39 whole numbers between 21 and 61
There are infinitely many numbers between 39 and 100.
13 combinations of 3
9
They are: 3*13 = 39