first divide it into 3 groups... 4 for each group...tvb now,tvbnow,bttvb" Z% @ I7 \* N
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...
s$ j$ B+ ^' _6 K$ K" y6 }den... left 4 balls...公仔箱論壇) _. R- w1 H7 |& V m
when u use tat 3 groups to test... u oredi know it is heavier or not...
- ^2 J5 f9 O# V0 Y9 V* ptvb now,tvbnow,bttvbso when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...( D# _( o) s7 T% f2 O
take the heavier or lighter 1... throw away tat 2 normal ball...tvb now,tvbnow,bttvb3 k* l- ]0 Z1 I% l! K( B
den u juz nit 2 test the last 2 balls...
. O; r9 d+ y: J, _! P5.39.217.77:8898same for now... take the heavier or lighter 1... |