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.
More logic riddles
A row goes: calendar, calendar, firework, calendar, calendar, firework, calendar, calendar. What comes next?
I am a sweet red-and-white stick that hangs on a tree. What am I?
A line goes: eraser, ruler, eraser, ruler, eraser. What comes next?
A line goes: pumpkin, squirrel, pumpkin, squirrel, pumpkin. What comes next?
Five runners finish a school marathon, and only these facts survive. Carmen finished ahead of Hugo. Hugo finished ahead of Mara. Boris finished ahead of Carmen. Mara finished ahead of Pavel. Who finished first?
The ruler is bigger than the book, and the eraser is bigger than the ruler. Which one is the middle size?