10
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The prime numbers between 1 and 9 are 2, 3, 5, and 7.
1 and 9
9
There are no 3 digit numbers between 0 and 9 because 0 and 9 are 1 digit numbers.
The sum of all numbers between 1 and 5 is infinite.The sum of whole numbers between 1 and 5 is 2 + 3 + 4 = 9