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You need a folder from a box with 100 folders. You check every third folder from the front but don't find the one you want. You then check every fourth folder from the front, but still can't find it.
You then start from the back and check every second folder; nothing. You check every fifth folder from the back; no luck.
You then see that the one you wanted was near the front of the box all along! What position from the front is the folder in?
Stay calm. Think it through carefully.
It was the second folder from the front. If you're good at sorting, then you know that this would be the case whether there were a hundred folders or a million!
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A big thanks to http://professorlayton4walkthrough.blogspot.com