first divide it into 3 groups... 4 for each group...www2.tvboxnow.com( l) A6 n. \% F) }( Z% p" J
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...
% X/ W: x6 a+ C5 q+ \( n- J! ~den... left 4 balls...
0 n5 e4 }& }& W9 r" Btvb now,tvbnow,bttvbwhen u use tat 3 groups to test... u oredi know it is heavier or not...tvb now,tvbnow,bttvb: j; v4 S/ ?; F* P% }8 g9 H
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...
+ V \- l. ]+ vtake the heavier or lighter 1... throw away tat 2 normal ball...
% N3 L1 K" D. Mden u juz nit 2 test the last 2 balls...
5 W$ O2 _! s: K% e/ `' s! i, ctvb now,tvbnow,bttvbsame for now... take the heavier or lighter 1... |