Proof of Sum of an Arithmetic Series - Corbettmaths

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Picked one by one from a mixed channel. Transcript check: both title readers certain; 4 of 5 sampled certain picks confirmed by transcript, none failed. Channel rule:

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A 4-minute video from corbettmaths: “Proof of Sum of an Arithmetic Series - Corbettmaths”.

Science & Math

Video by corbettmaths, played through YouTube's embedded player.

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