I'd really appreciate it if someone could please help me with this question as I'm really stuck on it.(adsbygoogle = window.adsbygoogle || []).push({});

Prove that the sum of the first n terms of an arithmatic series with first term a and common difference d is given by

1/2[2a + (n-1) d]

Thank you.

Cathy

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# Homework Help: Arithmatic series help

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