algorithm - N th term of series:0,1,3,6,10,15,21, -

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0,1,3,6,10,15,21,... each term gets incremented in order of natural numbers tried generate nth of series ended tle here's code 

s=0 for(int i=1;i<=n;i++)     s=s+(i-1);

can me better algorithm.

this series, gives n sum of natural number 0 n. there simple formula calculating (n * (n+1)) / 2.


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