first divide it into 3 groups... 4 for each group...tvb now,tvbnow,bttvb' q6 g. V" }0 G# ]- a, b9 P. f- _, 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...1 C/ E% C+ E" J% p7 K0 }% J& X8 M
den... left 4 balls...
9 B' p9 y" ~! Z) z2 w# ~when u use tat 3 groups to test... u oredi know it is heavier or not...
% B% |* u" r/ J公仔箱論壇so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...& j8 x: i1 h3 j
take the heavier or lighter 1... throw away tat 2 normal ball...
% w8 N) ?' d) nden u juz nit 2 test the last 2 balls...
. ?. ?% _, z% L7 ktvb now,tvbnow,bttvbsame for now... take the heavier or lighter 1... |