first divide it into 3 groups... 4 for each group...
7 r" p, J+ {6 q! O, wden use 2 groups to test... if the weight is same... den throw away these 2 groups.. if not... use another 1 group to test with tat 2 groups... throw away the same weight groups...
. ~+ U+ ^% T( W8 N% T& b9 Etvb now,tvbnow,bttvbden... left 4 balls...
( O. A* L: s2 S& g) e; stvb now,tvbnow,bttvbwhen u use tat 3 groups to test... u oredi know it is heavier or not...
% x; }; t o% R4 h+ W, m3 a6 ?公仔箱論壇so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...tvb now,tvbnow,bttvb u x: U' k4 R( e
take the heavier or lighter 1... throw away tat 2 normal ball...5.39.217.76. }9 x8 x: `0 _! P9 @3 d! i
den u juz nit 2 test the last 2 balls...tvb now,tvbnow,bttvb* D7 l8 I/ X4 N+ J6 s
same for now... take the heavier or lighter 1... |