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Three Tests, Take Three! (Posted on 2005-06-23) |
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You have nine brass rings, but three are actually gold. Can you pick these out using a balance scale three times at the most?
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Submitted by Old Original Oskar!
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Rating: 4.5000 (2 votes)
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Solution:
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(Hide)
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No, you can't. There are 84 ways of picking three rings out of nine. A scale can give three results (left heavier, right heavier, equal) so three times can differentiate among 27 results; it's no good, but 5 times could do. |
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