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Apr 7, 2019 at 11:33 comment added humn Your non mathematical 0s approach does fit the pattern, @Mel, but doesn't explain the equivalences as well as your excel solution.
Apr 7, 2019 at 9:38 comment added Mel @humn well, the non mathematical explanation would be that numbers with leading or trailing zeroes have no equivalence. 00,01,02,03,04,05,06,07,08,09,10,20
Apr 7, 2019 at 3:21 comment added humn Congratulations on the correct answer. And what a wonderfully visual and consistent explanation. Yet the intended explanation is simpler and not nearly as gorgeous.
Apr 4, 2019 at 22:03 history edited Mel CC BY-SA 4.0
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Apr 4, 2019 at 21:52 history answered Mel CC BY-SA 4.0