first divide it into 3 groups... 4 for each group...
, ^+ Z4 L6 V6 B: |; w& f- Vden 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...tvb now,tvbnow,bttvb! M k' s4 B# o L- n
den... left 4 balls...! h2 [% H5 V( r1 N4 m+ q
when u use tat 3 groups to test... u oredi know it is heavier or not...8 y4 B8 N9 q8 M2 c+ f
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...
. U1 F" \8 m1 V1 T$ gtake the heavier or lighter 1... throw away tat 2 normal ball...tvb now,tvbnow,bttvb" r4 ]0 Y* k: E% h/ J/ C
den u juz nit 2 test the last 2 balls...# U) S3 [, H1 N: M3 a- P- T3 ?
same for now... take the heavier or lighter 1... |