first divide it into 3 groups... 4 for each group...
* ]+ j4 F! p0 o: Y4 T) `公仔箱論壇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...
6 {8 A2 l( @9 |' e* a8 q5.39.217.76den... left 4 balls...
6 d. d) o$ l \/ Y7 s7 a7 z8 Atvb now,tvbnow,bttvbwhen u use tat 3 groups to test... u oredi know it is heavier or not...
1 ] @: I0 f# ]so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...
* U6 b: [, G; z. B6 E7 {5.39.217.76take the heavier or lighter 1... throw away tat 2 normal ball...
8 g0 W+ _0 {* O! p( f" N( k) Kden u juz nit 2 test the last 2 balls...tvb now,tvbnow,bttvb; |" O, f* H @, ?7 z
same for now... take the heavier or lighter 1... |