first, compare 6 and another 6. they must have difference. 公仔箱論壇1 c; U. Y' `5 _
second, divide those 6 heavier one into two, each has 3. u will find difference again.
1 ~! V+ q3 }5 h$ Fthird time, if u put 2 and they are equal, u will know the different one.
, C" q! c* u3 u* r! z7 E0 vtvb now,tvbnow,bttvbso easy.... |