first divide it into 3 groups... 4 for each group...公仔箱論壇1 M7 V+ ^- I: S3 M6 h3 ]8 b
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$ k- u! F* T8 g' J4 X$ N
den... left 4 balls...公仔箱論壇- w1 ?- X# X3 D/ w! B3 r5 A% x) c
when u use tat 3 groups to test... u oredi know it is heavier or not...www2.tvboxnow.com" `% u' x1 Y, V0 D1 M
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...3 W( c" d( e% V6 |# `! s
take the heavier or lighter 1... throw away tat 2 normal ball...
* i( Y7 f6 g+ R' M4 C$ z/ w+ W9 ]) Ztvb now,tvbnow,bttvbden u juz nit 2 test the last 2 balls...' d' B5 g5 [# R8 A- E K, P8 r
same for now... take the heavier or lighter 1... |