送交者: Tangduoling 于 2005-4-16, 14:44:06:

Gee I solved that primary school 4th grade question. Turns out those kids are enfant terrible...

Among 13 balls one can not find the defective ball by only weighing 3 times. 12 is the maximum for 3 weighings.

The general conclusion is that for N balls, if 2^m-4

• Not true. Three times will do for 13 balls, - antonin (82 bytes) 2005-4-17, 05:48:21
  • Well, you may not be able to determine - antonin (48 bytes) 2005-4-17, 05:50:00
    • True. but I suppose my formula should work for - Tangduoling (141 bytes) 2005-4-17, 15:27:05
• sorry incomplete post - Tangduoling (134 bytes) 2005-4-16, 14:46:34
  • The system doesn't like make do math symbols? - Tangduoling (355 bytes) 2005-4-16, 19:12:29

加跟贴