Mathematics

Mathematics, 19.08.2021 14:20, starreee

Find the sum Sn of the first n terms from the given sequence. 1, 1+2, 1+2+3, 1+2+3+4, ...
Please show your work and use Sigma Notation too. Thank you!

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Find the sum Sn of the first n terms from the given sequence. 1, 1+2, 1+2+3, 1+2+3+4, ...
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