A flat square of paper is folded as shown in the image. The broken lines indicate the original position of the paper, and the solid lines indicate the position of the folded paper. The paper is never turned or twisted. The folded paper always remains within the edges of the original square. After the last fold, a hole is punched in the paper. Your task is to mentally unfold the paper and determine the position of the holes on the original square. Choose the pattern of black circles that indicates the position of the holes on the original square.
Choose the answer that corresponds to the image for which the black dots represent holes in the unfolded paper.
- A
- B (correct answer)
- C
- D
- E
Explanation: The small corner-fold creates a 2-layer region in the top-right; subsequent halvings multiply it. The punch lands where the corner-fold layers overlap the quarter-fold layers, producing an asymmetric 5-hole pattern (a giveaway pattern only a careful solver notices).