130 карточек | Комбинаторика и теория чисел | Физтех-2019. Математика | Борис Трушин |

Whole-channel inclusion: Борис Трушин is an honest teaching channel (title sample + 3 transcripts read: The transcripts show structured, step-by-step worked math problem solutions typical of exam prep tutoring, consistent with genuine teaching content.); this title passed a strict title check (sonnet) after a labelling pass.

A 7-minute video from Борис Трушин: “130 карточек | Комбинаторика и теория чисел | Физтех-2019. Математика | Борис Трушин |”.

Video by Борис Трушин, played through YouTube's embedded player.