First a narrow strip along the top of a square sheet, a quarter of its height, is folded down. Then the left half is folded over the right half. One hole goes through the part with the strip and one through the part without it. Which figure shows the opened sheet?

Question

Accepted Answer

(c). Undo the left-right fold: both holes get twins on the left. Undo the strip fold: only holes lying under the strip get twins, mirrored up across the strip's crease into the top quarter. The lower holes stay as a pair: (c).

First a narrow strip along the top of a square sheet, a quarter of its height, is folded down. Then the left half is folded over the right half. One hole goes through the part with the strip and one through the part without it. Which figure shows the opened sheet?

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