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Riddle help please!!?
For a Math class based on George Golay's "How to Solve it!"
Nine wine glasses are in a row right side up.
Using both hands, you can turn over exactly six glasses at once.
If you do this repeatedly, reversing six glasses each time
(You can turn back glasses that have already been reversed),
what is the minimum number of reversals you need to get all nine glasses upside down at one time?
Explain your answer/methodology
2 Answers
- railbuffLv 71 decade agoFavorite Answer
never
there are an odd number of glasses right side up
if you invert six glasses this an even number
odd - even = odd
There will always be an odd number of glasses right side up.
Therefore there will never be an odd number of glasses upside down.
Nine is an odd number.
Source(s): retired math teacher
