first divide it into 3 groups... 4 for each group...5.39.217.77:8898& I8 w% \& W. e: e
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...
+ U7 \' o2 R* G V8 k公仔箱論壇den... left 4 balls...- g6 i, z+ m2 }
when u use tat 3 groups to test... u oredi know it is heavier or not...
8 |, {2 r: ?! A, wtvb now,tvbnow,bttvbso when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...% g: |6 ]0 P* E Y/ z4 T
take the heavier or lighter 1... throw away tat 2 normal ball...
# H- X6 L4 L! B* x; F0 cden u juz nit 2 test the last 2 balls...
3 h9 V: e/ R6 C! ~2 u- v: Y5.39.217.77:8898same for now... take the heavier or lighter 1... |