first, compare 6 and another 6. they must have difference.
. X+ u# o! V4 b3 Y) j9 b) dsecond, divide those 6 heavier one into two, each has 3. u will find difference again.
" ^0 n/ J3 C7 _; T- Q& {third time, if u put 2 and they are equal, u will know the different one.
* Z( s5 e* k0 D5 o$ T, Z/ P5 b6 E Wtvb now,tvbnow,bttvbso easy.... |