gensy850711

first divide it into 3 groups... 4 for each group...( w: z9 D; i& c) e$ j- u; R' ?
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...! p+ q. M5 A7 B  A) h% @4 c
den... left 4 balls...
0 F" b& A; ~8 o6 p1 `tvb now,tvbnow,bttvbwhen u use tat 3 groups to test... u oredi know it is heavier or not...
, f3 T* c. V* T  g: z9 f- q3 yso when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...公仔箱論壇- y; `5 i7 G3 J/ `8 ^. R
take the heavier or lighter 1... throw away tat 2 normal ball...
/ [5 S. x2 x+ t* t0 lden u juz nit 2 test the last 2 balls...tvb now,tvbnow,bttvb/ R+ K2 b( m, q" G0 D
same for now... take the heavier or lighter 1...