first divide it into 3 groups... 4 for each group...
! j/ z M0 h+ J: R4 @tvb 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...5.39.217.76: q+ Z2 Z8 m: p( U+ d
den... left 4 balls...tvb now,tvbnow,bttvb7 d! t2 H! A) \$ s; `3 k; V" F
when u use tat 3 groups to test... u oredi know it is heavier or not...
. N4 ~ n( i9 O' r+ M) Rso when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...tvb now,tvbnow,bttvb M3 c; G: `4 V* q
take the heavier or lighter 1... throw away tat 2 normal ball...tvb now,tvbnow,bttvb2 C/ E0 \4 P% S8 z
den u juz nit 2 test the last 2 balls...
- L7 o7 o" U- e/ Q5.39.217.76same for now... take the heavier or lighter 1... |