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If n is a positive integer, then the sum of the numbers 1,2,...,n is given by the formula n*(n+1)/2. In this case n=25. So the answer is 25*26/2=325.
102 + 52 = 125
These whole numbers go evenly into 125: 1, 5, 25, 125.
The sum of whole numbers 1 through 30 is 465.
The sum of the first five whole numbers is 10.
What to whole numbers have a sum of 12 and quotient of 3?