Prove: \[\huge S_n = \frac{n(a_n + a_1)}2\]

Prove: \[\huge S_n = \frac{n(a_n + a_1)}2\]

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it's an easy proof....but it's still nice to see some professional do it

i wrote that formula wrong...

See
\[\S_n = \cfrac{n}{2} (2a + (n-1)d)\]

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