first, compare 6 and another 6. they must have difference.
) _2 A$ O: i5 T; }" q7 qsecond, divide those 6 heavier one into two, each has 3. u will find difference again.tvb now,tvbnow,bttvb$ }1 M7 s: S$ w' _$ w' D1 l, }2 H
third time, if u put 2 and they are equal, u will know the different one.# B% z4 ~- f( R
so easy.... |