Twitter | Search | |
Fermat's Library
A simple visual proof that: 1+2+3+...+n = (n²+n)/2 ⚪ ⚫⚫⚫ ⚪⚪ + ⚫⚫ ⚪⚪⚪ ⚫ = ⚪⚫⚫ ⚫ ⚪⚪⚫ + ⚫ ⚪⚪⚪ ⚫
Reply Retweet Like More