first divide it into 3 groups... 4 for each group...
) I( {' K6 c% w* s7 D% p# Wden 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...+ b w: T8 _6 l
den... left 4 balls...tvb now,tvbnow,bttvb0 l; N8 N- J- j8 U
when u use tat 3 groups to test... u oredi know it is heavier or not...
, n/ Z; Z) o4 f公仔箱論壇so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...# b9 D4 T8 x" ^# R; x
take the heavier or lighter 1... throw away tat 2 normal ball...tvb now,tvbnow,bttvb* Q) k. b: f/ p; u; e7 A
den u juz nit 2 test the last 2 balls...tvb now,tvbnow,bttvb8 V" z3 U, X# e3 p: ^) v
same for now... take the heavier or lighter 1... |