first divide it into 3 groups... 4 for each group...公仔箱論壇! O, U2 L! R* \6 Q9 R2 ^# i2 o
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, c& M/ t! G, y2 W8 {
den... left 4 balls...公仔箱論壇& ?0 M/ x& l9 R- F
when u use tat 3 groups to test... u oredi know it is heavier or not...www3.tvboxnow.com$ y5 w# Z/ M5 P8 E
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...tvb now,tvbnow,bttvb0 l+ v( m3 i" I2 X# }
take the heavier or lighter 1... throw away tat 2 normal ball...公仔箱論壇6 s8 S; p; n1 k6 l$ u! @* `7 ]
den u juz nit 2 test the last 2 balls...
& Q" ?, E9 ~6 s# o" q( `same for now... take the heavier or lighter 1... |