i found the ans in 30 mins but dont know correct or not?公仔箱論壇: `1 l5 W* J1 j' B4 o8 [
ans is too long! but concepts are something like that:tvb now,tvbnow,bttvb# Z q/ {. q! [5 A
seprate 4 groups 3 balls in one group!
. l# s- M' @+ Z0 ]* {, Q# rtvb now,tvbnow,bttvbthe important part is the 2nd times which need to find out the fake ball is heavier or lighter by use the normal ball that u find at the first time!tvboxnow.com% a8 d5 C* R& S8 r% Z
the last part is 1ball vs 1ball! something like that |