You have 100 coins, 10 of them face down. With your eyes closed, divide them into two groups such that the number of coins facing the other way is the same.ā
This page is auto-translated from /nishio/10ęć®ć³ć¤ć³ć®åē using DeepL. If you looks something interesting but the auto-translated English is not good enough to understand it, feel free to let me know at @nishio_en. Iām very happy to spread my thought to non-Japanese readers.