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12 balls, one of which is defective. Use a balance to identify this defective item at least times.

Source: Internet
Author: User
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There are many discussions on this issue online,

The answer is:

 

Do some sorting here

 

From 12 balls to Tianping ball

Http://wenku.baidu.com/view/cd13d2b765ce05087632136f.html

The above document is comprehensive. Finally, it provides some mathematical analysis and mathematical models for ball problems.

 

 

 

The problem pool bils-Solution

Http://www.mathsisfun.com/pool_balls_solution.html

The solution provided by foreigners is the same as above, but the statement is more rigorous.

In addition, this maths is fun website is also good, it contains many mathematical puzzles and mathematical games, good.

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