first divide it into 3 groups... 4 for each group...& [ k0 _3 Y" W8 E6 F5 J' j
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,bttvb0 h/ U- f; A' M! V9 R! v/ {
den... left 4 balls...os.tvboxnow.com+ U* b3 T3 b; j" `0 d
when u use tat 3 groups to test... u oredi know it is heavier or not...+ {# h! y1 A1 j
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...os.tvboxnow.com0 j% U3 e* \3 |1 e
take the heavier or lighter 1... throw away tat 2 normal ball...os.tvboxnow.com N3 p( g* y. Z+ v% T, n3 i
den u juz nit 2 test the last 2 balls...
& o8 s r4 ], m7 _" n, gsame for now... take the heavier or lighter 1... |