A row goes: book, book, eraser, book, book, eraser, book, book. What comes next?
A eraser.
Every third one is a eraser.
About this riddle
Logic riddles give you a few facts and ask what must be true. List what you know, cross out what cannot be, and see what is left.
Difficulty: Medium. More like this: Logic riddles with answers or try Einstein's Logic Grid for a different kind of puzzle.
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