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随意 问题

Thinking question. Good prize

There are 9 identical balls, look the same but one of these 9 balls is slightly heavier than the rest . How can 你 figure out which ball heavier, 由 using this weighing scale only twice?

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 Thinking question. Good prize
 karolinak1999 posted 一年多以前
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随意 答案

True-Finn-Fan said:
going for it...
1 - 分裂, 拆分 the balls into three groups of three balls each.
2 - Weigh any two groups against each other. (first use)
3 - If the groups weigh the same then the heavier ball is in the third group, otherwise it is in the group that weighs more.
4 - We now know that the heavy ball is one of three.
5 - Using the group of balls that we know contains the heavy ball, weight any two balls against each other. (second use)
6 - If one of the balls is heavier then we have our answer. If the balls weigh the same then the third ball is the heavy one and we again have our answer. :3
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posted 一年多以前 
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Correct!
karolinak1999 posted 一年多以前
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sweet... :D
True-Finn-Fan posted 一年多以前
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