gensy850711

first divide it into 3 groups... 4 for each group...
) i" \' r7 ]8 o; b  O6 s9 I, oden 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...5.39.217.760 \6 L4 e/ J4 I9 f
den... left 4 balls...3 \" @5 U6 v  |& c5 f5 a
when u use tat 3 groups to test... u oredi know it is heavier or not...公仔箱論壇0 I- c' o( P4 q4 N5 V6 F$ J
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...% W' b9 p: `. T  _, p4 X. \
take the heavier or lighter 1... throw away tat 2 normal ball...
4 g' w0 ~$ A  F# }- p: d* y9 S3 S5.39.217.76den u juz nit 2 test the last 2 balls...
( X* K5 K. q# @$ s3 x1 Lsame for now... take the heavier or lighter 1...