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Odd one out

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Lewis Ellis | 23:16 Mon 11th Oct 2010 | Quizzes & Puzzles
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Which is the odd date out:
1584, 1692, 1729, 1809, 1980
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1729, its digits add up to 19, the others all add up to 18.
not sure, but I think it may be 1809 if the others were leap years.
Perhaps you can check on google.
1729 -The digits add up to 19 - The digits to all the others add up to 18
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Many thanks, hadnt tried anything like that, was going along a different line so thanks again!

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Odd one out

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