first divide it into 3 groups... 4 for each group...
4 N, A3 z8 H! k0 k* o; u5 N4 ^1 M( o$ Otvb 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...
- P* C: Y. H1 j# h K9 c0 r( D/ |# @den... left 4 balls...公仔箱論壇% r6 Z" u! g8 ^3 {/ e2 I
when u use tat 3 groups to test... u oredi know it is heavier or not...tvb now,tvbnow,bttvb; W$ t" e1 Y3 D" e! P! r- }
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...$ I4 \# o7 W) S4 }
take the heavier or lighter 1... throw away tat 2 normal ball...- H6 k8 i- \4 y& R
den u juz nit 2 test the last 2 balls...0 o# L6 D& V( `( G: z4 s* q
same for now... take the heavier or lighter 1... |