Найдите сумму: 1+ 1/(1∙2)+1/(2∙3)+...+1/(n(n+1))

Whole-channel inclusion: Valery Volkov is an honest teaching channel (title sample + 3 transcripts read: All three samples lack transcripts, so the channel verdict relies on the prior title-sample assessment of consistent, non-clickbait math teaching content.); this title passed a strict title check (sonnet) after a labelling pass.

A 7-minute video from Valery Volkov: “Найдите сумму: 1+ 1/(1∙2)+1/(2∙3)+...+1/(n(n+1))”.

Video by Valery Volkov, played through YouTube's embedded player.