The sum of all the integers between 100 and 999 is equal to 494450 - which also happens to be the answer to the sum 899 x 500 (which refers to the number of numbers multiplied by the mean number + 0.5).
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The sum of two positive numbers is always a positive number.
The sum of the first seven positive INTEGERS is 28. The sum of the fisrt seven positive numbers is infinitesimally small.
The sum of the first 100 positive even numbers is 10,100.
The answer is, obviously, 9.
The sum of the first six positive numbers (1 to 6) is 21.