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
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The sum of the first 5 numbers is 15. 1+2+3+4+5=15
The numbers are -1, 0, 1, 2 and 3.
They are: 2+3+5+7 = 17
The first three odd numbers are 1, 3, and 5. Their sum is 1 + 3 + 5 = 9.
The sum of the prime numbers from 1 to 12 is equal to 2 + 3 + 5 + 7 + 11 = 28.