I apologize for the title. This is my first post. If there is a way to change it, I can't find it.

Solve for n

$S_n=n(\frac {a_1+a_n}{2})$

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- Dec 18th 2017, 12:34 PM #1

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- Dec 18th 2017, 12:43 PM #2

- Dec 18th 2017, 12:51 PM #3

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- Dec 18th 2017, 01:00 PM #4

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- Dec 18th 2017, 01:22 PM #5

- Dec 18th 2017, 01:54 PM #6

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