I'm going to put the notes first on this problem, since it's mostly an apology for the way in which I'm solving this one.
Notes: I went into this problem with a triage mentality. My assumption for all three of these problems was that the lowest three numbers were going to start with 1 and the highest three numbers would start with 9. If that assumption led to a solution, it would take less than a minute and be worth five points. If not, I would likely not stick around to work out what went wrong. As it turned out, my assumptions were correct and I got 15 points in less than five minutes.
In that spirit, I'm not going to rigorously demonstrate that these answers are unique. I think that speed was more important than logic for these small puzzles.
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#2 must be 1119 and #1 is 1111. To be between #3 and #5, #4 must be 1911. To have #7 be more than #6, #9 is 9911. |
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Nothing but net. |
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If #2 were 11xx, then it would have to be 1199 to be more
than #1, but then #6 would be more than #7. So #2 is 19xx.
Since #8 is more than #7, #7 is 9991 and #8 is 9999.
#6 must be 919x, #5 must be 91xx to be "two" more than #3. To have #4 be less than #5 but more than #3, it must be 1999, and #6 is 9191 to make it different from #5. |
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And that was the hard one. |
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#1 must be #11x9 to be less than #2. #3 and #4 must be 1991 and 1999 respectively. #5 must be 919x, so #6 is 9911 to make it more than #5 but less than #7. #8 must be 9991 to make it more than #7. |
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Three up, three down. |