1. test 3 by 3 as the first test
3 E# S5 p; H( B2 x# X! ?* ltvb now,tvbnow,bttvb2. if the first test balls are not the same, take 2 from the heavier side and one from the lighter side on the balance, put the normal 3 at the other side of the balance.. y- A O7 s, ` ^- M5 O5 Q; r
3. if the normal one is heavier, 2 steps is enough as the lighter one what we look for.
$ O+ y8 R/ }* X1 C4. if the normal one is ligher, check the 2 heavier one and look for heavier one.: m# T" P/ b8 I3 t; h* s ^4 S
5. if the balls are the same at the first test, take 2 balls from the reminding and see if they are the same. If yes, the reminding one is the answer. If they are not the same test it with the reminding ball... |
發表於 2011-4-29 05:21 AM
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等我试下先！~~
