first divide it into 3 groups... 4 for each group...
) d ~9 ?" b. y: mtvb 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...
9 R0 c J: b: z* |9 Y8 F5.39.217.77den... left 4 balls...
1 P2 x( F, n- n2 Lwhen u use tat 3 groups to test... u oredi know it is heavier or not...
0 |' N) v% B6 u0 V1 Qso when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...5.39.217.77 T6 g) O0 c& M
take the heavier or lighter 1... throw away tat 2 normal ball...
- {% @' i0 K. J) a- t- otvb now,tvbnow,bttvbden u juz nit 2 test the last 2 balls...4 p/ a3 f" m( W3 v1 C5 ?
same for now... take the heavier or lighter 1... |