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Link to prepare packs from zero to one hundred https://riaziateshirin.com/product-ca... This beautiful problem was selected from the last math competition held jointly by Harvard and MIT universities. If you think of another method, please comment so we can use it???????? If you like this type of math challenge questions, I suggest you subscribe to the channel and activate the bell next to it so you don't miss the next videos. Link to the Instagram page with more than 600 challenge problems⬇️ https://www.instagram.com/riaziateshi... Link to the Telegram channel⬇️ https://t.me/riaziateshirin_rahimi