papersilove
Tuesday, January 12, 2021
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Fermat's Library
@fermatslibrary
A simple visual proof that: 1+2+3+...+n = (n²+n)/2
⚪ ⚫⚫⚫
⚪⚪ + ⚫⚫
⚪⚪⚪ ⚫
=
⚪⚫⚫ ⚫
⚪⚪⚫ + ⚫
⚪⚪⚪ ⚫
1/11/21, 8:21 AM
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