first divide it into 3 groups... 4 for each group...
/ G3 M& m1 W' a Wtvb 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...
( B- z: {. q+ ~- n7 y2 ^den... left 4 balls...2 L/ c" E4 E. h# t) o, V7 V
when u use tat 3 groups to test... u oredi know it is heavier or not...5.39.217.777 A: g: q8 G8 z' s- w$ n2 \& `9 F
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...tvb now,tvbnow,bttvb. M8 E( h0 v1 B/ c) K% \
take the heavier or lighter 1... throw away tat 2 normal ball...5.39.217.772 X, [% d/ k1 g; ^4 C
den u juz nit 2 test the last 2 balls...
/ v) P4 n6 r. x5.39.217.77same for now... take the heavier or lighter 1... |