SOLUTION: Find the sum of the first 260 positive odd integers

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Question 1047693: Find the sum of the first 260 positive odd integers
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Check the summation formula.

%28260%2F2%29%281%2B260%29

Answer by ikleyn(52788) About Me  (Show Source):
You can put this solution on YOUR website!
.
Regarding the sum of the first "n" integer numbers, see the lessons
    - Arithmetic progressions
    - The proofs of the formulas for arithmetic progressions
    - Problems on arithmetic progressions
    - Word problems on arithmetic progressions
in this site.

The sum 1 + 2 + 3 + . . . + n = %28n%2A%28n%2B1%29%29%2F2.