first divide it into 3 groups... 4 for each group...公仔箱論壇+ f4 U$ E# p1 ?% }
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,bttvb7 _0 I5 C5 m# }( \. B; {
den... left 4 balls...
7 Z) v9 |6 p3 V& S/ v; O- u1 K& W5 M公仔箱論壇when u use tat 3 groups to test... u oredi know it is heavier or not...
. T. z+ p% R& l. A5.39.217.76so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...
' Y% h/ \& r9 a. p# m3 q* e( @. mtvb now,tvbnow,bttvbtake the heavier or lighter 1... throw away tat 2 normal ball...1 Y+ z, f( a. w
den u juz nit 2 test the last 2 balls...5.39.217.76: w! P; B, u3 z5 ^
same for now... take the heavier or lighter 1... |