Kelly cannot remember the formula for the sum of a finite arithmetic sequence, so she is going to try to derive it. her problem is to find the sum of the numbers 1 to 500. what should she do first?

125250

Step-by-step explanation:

We have to find the sum of ( 1 + 2 + 3 + 4 + 5 + ........... + 498 + 499 + 500 ) with out using the formula of sum of a finite A.P. series.

We can otherwise remember the formula of sum of first n natural numbers as

Here in this case n = 500.

So the sum is . (Answer)