1. divide 6 and 6, both sides will not equal/ E+ w3 h7 w0 _6 F. D6 V
2. take any side of the 6, divide then 3 and 3, again both sides will not equal( F$ g& I) h& u" g ` Q4 Y
3. take any 2 and weigh them公仔箱論壇* B5 p! O$ Y# T& A3 v$ d; U7 G, K
if they equal, the one left is the ball.