# Wrong answer when using summation

**URL:** <https://cl.desmos.com/t/wrong-answer-when-using-summation/7654>\
**Category:** Questions\
**Created:** [January 8, 2025, 6:57pm UTC](https://cl.desmos.com/t/wrong-answer-when-using-summation/7654 "2025-01-08T18:57:14Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Spencer\_Waldron](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/spencer_waldron/32/6506_2.png) [@Spencer\_Waldron](https://cl.desmos.com/u/Spencer_Waldron)\
**Post date:** [January 8, 2025, 6:57pm UTC](https://cl.desmos.com/t/wrong-answer-when-using-summation/7654/1 "2025-01-08T18:57:14Z")

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[Heres my problem.](https://www.desmos.com/calculator/fdakhlooxj) The summation seems to be incorrect. I feel like it’s something i’m not understanding, but i’m asking just in case.

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**Author:** ![Daniel\_Grubbs](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/daniel_grubbs/32/719_2.png) [@Daniel\_Grubbs](https://cl.desmos.com/u/Daniel_Grubbs)\
**Post date:** [January 8, 2025, 7:01pm UTC](https://cl.desmos.com/t/wrong-answer-when-using-summation/7654/2 "2025-01-08T19:01:09Z")

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A similar question came up recently. Summation doesn’t assume everything following is part of it. Put `3n+2` in parentheses, and I believe you’ll get the result you’re expecting.