Man Finds Wallet, Leaves Math Problem, then Goes Viral

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🛍 Check out my math fashion brand! https://mathshion.com/ ❤️ Join the channel to get exclusive and early videos, original music, math lectures, and more! https://www.youtube.com/channel/UCyEKvaxi8mt9FMc62MHcliw/join A man found a lost black wallet in Finland, he wrote a note and left it there for the wallet's owner to find. On this note he asked the wallet owner to plug his birthdate into an equation to get the man's phone number so he could call and arrange a recovery of the wallet. But how secure is this code? There would seemingly be many possible birthdates a malicious actor could try plugging in to find the man's phone number - but with a bit of thought, the number of possibilities can be significantly reduced. #viralmaths #maths #mathpuzzle More Math Chats: https://www.youtube.com/playlist?list=PLztBpqftvzxXQDmPmSOwXSU9vOHgty1RO Business Inquiries: [email protected] Textbooks I Like! Graph Theory: https://amzn.to/3JHQtZj Real Analysis: https://amzn.to/3CMdgjI Abstract Algebra: https://amzn.to/3IjoZaO Linear Algebra: https://amzn.to/43xAWEz Calculus: https://amzn.to/3PieD1M Proofs and Set Theory: https://amzn.to/367VBXP (available for free online) Statistics: https://amzn.to/4d5HbUQ Discrete Math: https://amzn.to/3qfhoUn Number Theory: https://amzn.to/3JqpOQd Outro music: https://youtube.com/shorts/tfifiSdTZRg Follow Wrath of Math on... ● Instagram: https://www.instagram.com/wrathofmathedu ● TikTok: https://www.tiktok.com/@wrathofmathedu ● X: https://x.com/wrathofmathedu SOURCES https://en.wikipedia.org/wiki/Telephone_numbers_in_Finland#Mobile_numbers https://yle.fi/a/3-8074149 https://www.statista.com/statistics/1448352/mobile-payments-adoption-in-pos-in-finland/ https://www.reddit.com/r/mildlyinteresting/comments/1jnxnfg/i_found_a_wallet_on_a_saturday_i_left_a_note_in_a https://www.newsweek.com/stranger-finds-lost-wallet-returns-owner-viral-reddit-2053788 https://people.com/man-creates-clever-equation-to-return-strangers-lost-wallet-reddit-11708630 https://techbreak.com.br/went-viral-man-creates-secret-code-to-find-the-true-owner-of-a-wallet-found-on-the-street https://nypost.com/2025/03/31/lifestyle/good-samaritan-devises-ingenious-hack-to-ensure-lost-wallet-finds-its-rightful-owner 0:00 Intro 2:00 Questions Answered 4:04 Revising the Odds 8:21 Applying Single Digit Rule 11:56 Finland Mobile Numbers 14:37 What Happened? 14:59 Mathshion