first divide it into 3 groups... 4 for each group...tvb now,tvbnow,bttvb% T6 i y9 H n+ f. ?( d8 g& j) W
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...5.39.217.77:88988 c' _. e6 @0 l3 W9 g, g( D# h
den... left 4 balls...9 U& p4 T' a: t( s& Q+ Z
when u use tat 3 groups to test... u oredi know it is heavier or not...
- {! A$ a' J1 ]+ l' g7 h! Ytvb now,tvbnow,bttvbso when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...
: S. o. t: B4 o Gtake the heavier or lighter 1... throw away tat 2 normal ball...5.39.217.77:8898$ V1 @( g- G) x8 T* V
den u juz nit 2 test the last 2 balls...+ ~. n+ {) b$ L3 o5 \ D3 w
same for now... take the heavier or lighter 1... |