first divide it into 3 groups... 4 for each group...
+ R# n( C* X% n" `, Y7 xden 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 p* W) _ x! vden... left 4 balls...公仔箱論壇. S+ @8 M$ J0 C/ w: g8 ?
when u use tat 3 groups to test... u oredi know it is heavier or not...
% P/ V$ s9 d V" T1 A4 N3 R( j8 Kso when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...tvb now,tvbnow,bttvb; s& P8 f1 A! Z" ?
take the heavier or lighter 1... throw away tat 2 normal ball...
0 h$ e7 N8 y7 W2 T8 Otvb now,tvbnow,bttvbden u juz nit 2 test the last 2 balls...
9 W7 V4 W( q6 t7 `* }% b5.39.217.76same for now... take the heavier or lighter 1... |