first divide it into 3 groups... 4 for each group...
- }0 h6 I" B, y- Etvb 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...
5 ~4 q; P: U: [8 r, M" bden... left 4 balls.../ b# Z ~* i1 W# K2 b( b
when u use tat 3 groups to test... u oredi know it is heavier or not...
! S/ b( v1 B7 z& s1 i8 y% V7 q: c& _so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1... x) f/ c( a3 W) Z; i8 A
take the heavier or lighter 1... throw away tat 2 normal ball...$ w- ~5 B0 K# m6 O [2 N& ]5 t
den u juz nit 2 test the last 2 balls...tvb now,tvbnow,bttvb: r K# D5 f4 Z" [6 n) B
same for now... take the heavier or lighter 1... |