gensy850711

first divide it into 3 groups... 4 for each group...tvb now,tvbnow,bttvb- C& ]! d; M/ n/ l# V' E; U
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...
$ l% m7 }7 M  ^1 y  P. J, ?+ A5.39.217.77den... left 4 balls...公仔箱論壇" p# c& n' d* L2 x8 q. t4 ]. ~" A* i
when u use tat 3 groups to test... u oredi know it is heavier or not...
  [9 q( S2 A5 {$ Rso when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...
; O% M" r3 d; h0 H5 T. Z5 ytvb now,tvbnow,bttvbtake the heavier or lighter 1... throw away tat 2 normal ball...
3 F6 z/ |( W1 i) Z. ]$ x5.39.217.77den u juz nit 2 test the last 2 balls...
/ `9 ?' }0 W& ?2 P) e0 {5.39.217.77same for now... take the heavier or lighter 1...