Uh, Sorry about the following adult's link. I'd like you guys to play the ball with guessing 2 digits as the ball rule explains.Is it magic or what? What kind of program can do such fun thing???
剛剛用程式跑了一下,從10到99,減掉十位數和個位數這兩位數字之合,結果會有9,18,27,36,45,54,63,72,81這幾種數字,再看看右邊那個表,對應的符號會一直變,但每一次這幾個數字都是同樣的符號,所以當然每次都能猜中囉!就是這樣....