first divide it into 3 groups... 4 for each group...5.39.217.76( y% S. K5 Q/ P d. ~/ p
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...
8 T: l6 O: `5 B! y7 bden... left 4 balls...# w1 y% D% B8 _- w2 x- u
when u use tat 3 groups to test... u oredi know it is heavier or not...tvb now,tvbnow,bttvb# j Z, n( x1 f5 D4 y
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...% A b3 H0 U9 a3 T
take the heavier or lighter 1... throw away tat 2 normal ball...tvb now,tvbnow,bttvb1 f8 L: l5 ]2 ]: Y5 z
den u juz nit 2 test the last 2 balls...5.39.217.76& c9 j: I* J3 a' R
same for now... take the heavier or lighter 1... |