first divide it into 3 groups... 4 for each group...www3.tvboxnow.com* d7 R# v3 S) z% U P- L, Y+ }: g+ t
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...
$ E4 V9 Q5 G2 O# ztvb now,tvbnow,bttvbden... left 4 balls...公仔箱論壇: W' {1 g1 @3 u
when u use tat 3 groups to test... u oredi know it is heavier or not...
! f1 f( a# I2 M6 A公仔箱論壇so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...
0 I- @: n; y! btake the heavier or lighter 1... throw away tat 2 normal ball...www3.tvboxnow.com4 k6 z R3 \& p, Z, t) L
den u juz nit 2 test the last 2 balls...
& X+ {* d- P# C' Fsame for now... take the heavier or lighter 1... |