first divide it into 3 groups... 4 for each group...
6 M4 C5 [" |7 k/ v: m! e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...
4 B h% K5 a5 D# t3 b) ?den... left 4 balls...
! b0 m0 i& r5 u; b) I; A- Mwhen u use tat 3 groups to test... u oredi know it is heavier or not...5.39.217.777 Y- O$ v, T' N* D/ L1 m
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...tvb now,tvbnow,bttvb- Q1 b7 c( t7 Z7 ^7 } x4 Q
take the heavier or lighter 1... throw away tat 2 normal ball...tvb now,tvbnow,bttvb7 `3 P$ C2 u# P" [$ M2 i9 R
den u juz nit 2 test the last 2 balls...
' E& e# d; q$ J5 ~# A! i8 c; p5.39.217.77same for now... take the heavier or lighter 1... |