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Link to prepare packs from zero to one hundred https://riaziateshirin.com/product-ca... This is a unique problem from the joint math competition between Harvard and MIT universities. If you come up with another method, please comment so that I and the rest of my friends 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