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We are starting to study number theory as part of my annual course ILYICH. There will be 9 webs and 1 web with an expert of the Unified State Exam. We will analyze the main ideas of these problems, look at all three points - a, b, c. Learn to think a little like an Olympiad)) You can sign up for the course on the 19th issue in TG: https://t.me/ilchegg/411 Time codes: 0:00 - Theory. Decimal notation of a number 22:06 - Divisibility 41:52 - Problem 1. 1:13:50 - Problem 2. 1:31:12 - Push-ups 1:33:54 - Problem 3