first divide it into 3 groups... 4 for each group...: U& ^5 w! o+ h
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...tvb now,tvbnow,bttvb. U3 e' z3 Q1 X9 z: O7 L6 J
den... left 4 balls...www2.tvboxnow.com, u G9 `# j X. F6 T
when u use tat 3 groups to test... u oredi know it is heavier or not...
* B) @* \" w% U# ctvb now,tvbnow,bttvbso when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...0 ^! Q. A# U" ?* N8 V8 Z, u$ l
take the heavier or lighter 1... throw away tat 2 normal ball...
# F* l6 o3 E$ [3 s/ zwww2.tvboxnow.comden u juz nit 2 test the last 2 balls...公仔箱論壇1 f* k8 O. Y! ^6 n+ {! |3 A
same for now... take the heavier or lighter 1... |