first divide it into 3 groups... 4 for each group...
% s6 h' W9 ]+ t2 qtvb now,tvbnow,bttvbden 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...公仔箱論壇4 n1 r7 O" M8 s( X! @ k/ K
den... left 4 balls...
2 H; B" a8 z4 m$ a6 awhen u use tat 3 groups to test... u oredi know it is heavier or not...
& H. {2 a& e5 A$ C" x$ l; J5.39.217.77:8898so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...tvb now,tvbnow,bttvb( z1 {- x; c3 H( o5 h
take the heavier or lighter 1... throw away tat 2 normal ball...- m1 a" ], G( \
den u juz nit 2 test the last 2 balls...公仔箱論壇8 `* X% Y* X( A
same for now... take the heavier or lighter 1... |