gensy850711

first divide it into 3 groups... 4 for each group...
2 j+ U- M+ ~9 J5 e& B' X; P1 T5.39.217.77den 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; J* o6 C/ R, ~* o+ r
den... left 4 balls...
. c9 G& {! @/ m/ ewhen u use tat 3 groups to test... u oredi know it is heavier or not...
7 y$ e3 `# A1 ]6 r1 N+ [公仔箱論壇so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...
) k/ w. a3 M% Z$ i- G/ B公仔箱論壇take the heavier or lighter 1... throw away tat 2 normal ball...
" z% K2 a' A& U$ K; k* `. [8 fden u juz nit 2 test the last 2 balls...
  y2 T$ U( x# D( Q5 V: ~, F9 P公仔箱論壇same for now... take the heavier or lighter 1...