memorandum@tumblr.

Sep 20 2012
【数学の不可解なところランキング】
第5位:人数分用意されない飴
第4位:同時に自宅を出発しない兄弟
第3位:池を周回するだけの兄弟
第2位:水槽に水を注ぐ複数の蛇口
第1位:秒速1cmの速さで動く点P

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