gensy850711

first divide it into 3 groups... 4 for each group...
7 j) Y. m  W0 U" Pden 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...
# y  G5 [/ i6 \. w1 ^tvb now,tvbnow,bttvbden... left 4 balls...5 a7 y  e9 B* [4 w  a( G+ {) _" D
when u use tat 3 groups to test... u oredi know it is heavier or not...5.39.217.77:88989 h4 g/ Q/ X& X% U" n( `; [
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...
& `1 i+ c- f) Y6 O8 N0 @tvb now,tvbnow,bttvbtake the heavier or lighter 1... throw away tat 2 normal ball...) M8 o, s4 E4 A3 [/ R: W8 a* J* A5 j
den u juz nit 2 test the last 2 balls...
* ^$ E( u* O1 i( a  l公仔箱論壇same for now... take the heavier or lighter 1...