SOLUTION: find the sequence and the series of {1+2+3+4...n}

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Question 1044680: find the sequence and the series of {1+2+3+4...n}
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Pattern is plus-one; and for the series, either lookup the formula or derive the formula.

sum%28n%2Ci=1%2Ci=n%29=%28n%2F2%29%281%2Bn%29

Answer by ikleyn(52787) About Me  (Show Source):