first divide it into 3 groups... 4 for each group...
4 X! @7 m. z' E, H. }0 ?tvb now,tvbnow,bttvbden 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...2 Y5 u8 b9 D5 M: b9 S
den... left 4 balls...5.39.217.77:88984 s4 Y: z' g7 T9 ^
when u use tat 3 groups to test... u oredi know it is heavier or not...1 F8 E5 X+ P: t6 t) o' I
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...
1 g3 u# Y' m5 d5 y/ ntake the heavier or lighter 1... throw away tat 2 normal ball...
$ v' R5 _) m/ g4 O( o0 ktvb now,tvbnow,bttvbden u juz nit 2 test the last 2 balls...
' _$ q% }( s- _) Dsame for now... take the heavier or lighter 1... |