first divide it into 3 groups... 4 for each group...
1 @$ g" t `; e; z5 [8 `tvb now,tvbnow,bttvbden 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...
3 Q5 Q' K! ~6 `. Y- y5 r) }; qtvboxnow.comden... left 4 balls...
: `+ n+ l3 x. c( s( ?0 ]& Htvb now,tvbnow,bttvbwhen u use tat 3 groups to test... u oredi know it is heavier or not...
" F: r5 j Z: H2 I7 K" Xtvboxnow.comso when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...
4 z) i+ O0 p( M; Ptvboxnow.comtake the heavier or lighter 1... throw away tat 2 normal ball...# Y, L' z* h) n; V
den u juz nit 2 test the last 2 balls...
* L& ?% A6 i7 Msame for now... take the heavier or lighter 1... |