The sum of the first n terms of a series is n(n+2). Find the first three terms of the series.
I don't have a clue! All I've got is sn=n(n+2)
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Arithmetic progressions watch
- Thread Starter
- 03-02-2017 17:26
- 03-02-2017 17:44
Last edited by joostan; 03-02-2017 at 17:55.
- 03-02-2017 17:53
- 03-02-2017 18:03
Notice, that when
You now need to find, and . Good luck, I hope what I've said helps.Last edited by Naruke; 03-02-2017 at 18:06.