gensy850711

first divide it into 3 groups... 4 for each group...
% ?' A; ?2 @* ]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...
9 K6 n" Z6 f; o5 L5.39.217.76den... left 4 balls..., K% Q& P1 k8 Z
when u use tat 3 groups to test... u oredi know it is heavier or not...
  L" h$ h8 u3 tso when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...3 c) o. c) {9 p% s0 H9 p
take the heavier or lighter 1... throw away tat 2 normal ball...tvb now,tvbnow,bttvb# z* K' P, @1 r5 ?
den u juz nit 2 test the last 2 balls...6 |7 d7 l, D+ W3 O4 [9 p$ }: h8 [* j
same for now... take the heavier or lighter 1...