first divide it into 3 groups... 4 for each group...
9 s, q Q t* P( x8 C! W5.39.217.77den 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...公仔箱論壇" {' E* s" J4 E7 W2 O; E, T5 [
den... left 4 balls...tvb now,tvbnow,bttvb0 \+ ?0 X8 l/ z# [" t
when u use tat 3 groups to test... u oredi know it is heavier or not...
, y6 }! C9 \$ h- Rso when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...公仔箱論壇' Q/ R, w" c' {8 z( p& I, j
take the heavier or lighter 1... throw away tat 2 normal ball...
# G5 {7 A8 D, s3 M; }7 @) {3 Z4 E5.39.217.77den u juz nit 2 test the last 2 balls...
7 D$ n+ R: Y+ Bsame for now... take the heavier or lighter 1... |