first divide it into 3 groups... 4 for each group...' g! v3 g& J, c. A; x
den 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! O9 `# } M) u6 J4 H
den... left 4 balls...os.tvboxnow.com) s# }1 P5 P2 u' e7 V
when u use tat 3 groups to test... u oredi know it is heavier or not...os.tvboxnow.com) ~% a/ d: O8 ~, \# Z
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...
7 ?9 o, H, t' C" x+ l+ gtake the heavier or lighter 1... throw away tat 2 normal ball...
4 i" z A6 y. i* a1 ~os.tvboxnow.comden u juz nit 2 test the last 2 balls...
# m4 n3 d/ b1 J$ c; Bsame for now... take the heavier or lighter 1... |