first divide it into 3 groups... 4 for each group...tvb now,tvbnow,bttvb) n7 d4 `8 S Y' t) I- U2 G
den 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3 b J0 C4 h% k
den... left 4 balls..., {" V. ]& w0 g0 o
when u use tat 3 groups to test... u oredi know it is heavier or not...
/ k& [& d6 ?6 f( M1 [4 O, B; eso when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...
% `$ l1 O% [7 E& r" f2 N" [! ~tvb now,tvbnow,bttvbtake the heavier or lighter 1... throw away tat 2 normal ball...公仔箱論壇! m0 B& ]5 M6 u5 p o+ j% e# |* H
den u juz nit 2 test the last 2 balls...tvb now,tvbnow,bttvb# m+ n) C$ w0 B
same for now... take the heavier or lighter 1... |