first divide it into 3 groups... 4 for each group...
3 A. n- U$ k6 G4 Z! w: Qos.tvboxnow.comden 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...
+ o: T0 H. z. N: ftvb now,tvbnow,bttvbden... left 4 balls...
# g/ S4 `' i8 a! ^" _) b% d! ^tvb now,tvbnow,bttvbwhen u use tat 3 groups to test... u oredi know it is heavier or not...- o6 ~* s2 ]: O3 c! r0 n9 j, F
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...tvb now,tvbnow,bttvb) M z2 T( D, d# K- U
take the heavier or lighter 1... throw away tat 2 normal ball...3 p8 c4 _1 J7 P$ \$ U# ?
den u juz nit 2 test the last 2 balls...
" ?9 S% s7 ?1 x# Gsame for now... take the heavier or lighter 1... |