first divide it into 3 groups... 4 for each group...tvb now,tvbnow,bttvb1 d) K2 F$ y, w- W1 v* m9 ]
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...tvb now,tvbnow,bttvb* Z6 ~' {9 D H0 ]/ P& I
den... left 4 balls...5.39.217.76* g9 \4 H1 ^+ J" B1 A
when u use tat 3 groups to test... u oredi know it is heavier or not...9 `( @' p# `: S1 }' R" E
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...
! o4 g* T* C3 Z, l8 ^( t, f. ~take the heavier or lighter 1... throw away tat 2 normal ball...0 z4 V- s- _# D5 \- J, j
den u juz nit 2 test the last 2 balls...3 F3 e& J2 v+ Z# T" T
same for now... take the heavier or lighter 1... |