first divide it into 3 groups... 4 for each group...
/ S* w" w: E/ S3 Lden 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...tvb now,tvbnow,bttvb, {6 q/ \8 A$ x, @" p! B1 y
den... left 4 balls...
7 U# [1 h! e8 F公仔箱論壇when u use tat 3 groups to test... u oredi know it is heavier or not...tvb now,tvbnow,bttvb, |* U% B" }/ i9 b z0 g
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...
- }; m& U" F- |$ }) N8 r' Wtake the heavier or lighter 1... throw away tat 2 normal ball...
/ ~6 w: n* {/ C$ [4 |% f' qden u juz nit 2 test the last 2 balls...
0 K3 K; i) e. Wtvb now,tvbnow,bttvbsame for now... take the heavier or lighter 1... |