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This is probably very elementary for seasoned puzzlers yet I must request assistance with the following sequence: 119, 019, 609, 809, xxx, 909 What is the underlying principle here? Edit: Source: 2.2., 4, https://www.helsinki.fi/sites/default/files/atoms/files/psykologia_valintakoe_2019.pdf

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    $\begingroup$ This seems like a puzzle you got from elsewhere. If so, please provide attribution to the original creator. Puzzles without attribution may be closed. $\endgroup$ – bobble Sep 28 '20 at 14:47
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    $\begingroup$ (@bobble Ah yes, I overlooked that in my haste to answer, oops!) dimlyluminous, please just edit your post to explain where this puzzle comes from, so the original content creator receives credit. Thanks, and welcome to Puzzling! $\endgroup$ – Stiv Sep 28 '20 at 14:57
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The answer is:

L09

You might think I have made a mistake there, but I suggest that you:

consider what all of the terms of your sequence look like when written on a calculator (or similar 7-segment display) and turned upside down!

Try it yourself and see!

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  • $\begingroup$ Classic parking place puzzle. Upvote. $\endgroup$ – z100 Sep 29 '20 at 20:06

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