first divide it into 3 groups... 4 for each group...tvboxnow.com9 I/ b3 Y7 u; M# T% `
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...
$ \' W H' ]* ]& f7 U( J! Q; W公仔箱論壇den... left 4 balls..., S3 V7 S# o/ [* x
when u use tat 3 groups to test... u oredi know it is heavier or not...tvb now,tvbnow,bttvb. {/ K8 h6 \9 {' b) @' k) r7 w6 z) j8 K6 x
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...tvb now,tvbnow,bttvb' p( b$ v- _. t. w% L) o
take the heavier or lighter 1... throw away tat 2 normal ball...
+ h, G7 c8 f" stvb now,tvbnow,bttvbden u juz nit 2 test the last 2 balls...5 P; w$ j' H+ h; i0 f
same for now... take the heavier or lighter 1... |