SOLUTION: What is the sum of the first 500 counting numbers? i.e., The sum of 1+2+3+4...496+497+498+499+500? How about only the odd numbers?

Question 485643: What is the sum of the first 500 counting numbers? i.e., The sum of 1+2+3+4...496+497+498+499+500? How about only the odd numbers?
Found 2 solutions by richard1234, MathLover1:
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
Sum of first 500 counting numbers = 500(501)/2 = 125250.

Sum of first 500 odd positive numbers = 500^2 = 250000.
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
add first and last

Do the same with the second highest and the second smallest.

As you can see, all the totals equal . Now just divide by since you are using two unique numbers per combination.

So, the average is and there are number is the list, so the is:

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