first divide it into 3 groups... 4 for each group...
Y+ u0 R/ v, m/ \" oden 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...
- {( t2 s& k# n0 Utvb now,tvbnow,bttvbden... left 4 balls...
7 l/ G1 x! k# m4 |when u use tat 3 groups to test... u oredi know it is heavier or not...公仔箱論壇% I# ^( o4 u' p1 T; v
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...公仔箱論壇+ v4 Z) Q9 F; `# h* Q' q
take the heavier or lighter 1... throw away tat 2 normal ball...
! O8 @+ a4 n, N/ t' p% s) Pden u juz nit 2 test the last 2 balls...
0 v" o! V& n% [8 U1 Ytvb now,tvbnow,bttvbsame for now... take the heavier or lighter 1... |