A visual proof why 1+3+5+...+(2n-1)=n²
⚪⚫⚪⚫⚪⚫⚫⚫⚪⚫⚪⚫⚪⚪⚪⚫⚪⚫⚫⚫⚫⚫⚪⚫⚪⚪⚪⚪⚪⚫⚫⚫⚫⚫⚫⚫ https://twitter.com/fermatslibrary/status/1215986721902473216
https://t.me/private_channel_c14370a/3393
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