first divide it into 3 groups... 4 for each group...
9 o' T9 ` |& q( X' o6 S* dden 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...
1 e% @# {% X+ w) U! h, c5.39.217.76den... left 4 balls...( o1 V( h! D4 n- x4 ]4 n; X
when u use tat 3 groups to test... u oredi know it is heavier or not..." S, Q9 q* a* x3 T% V
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...
! p }+ B7 C3 o" wtake the heavier or lighter 1... throw away tat 2 normal ball...
* Z" b, L: @" Vtvb now,tvbnow,bttvbden u juz nit 2 test the last 2 balls...
) y6 U; \* R1 q: |same for now... take the heavier or lighter 1... |