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An upright paper strip is folded top end down onto the bottom end, and then the folded strip is folded top down again. A round and a square hole are punched. Which figure shows the strip opened?

Competition practicePaper Folding & Punching
  • A(b)
  • B(a)
  • C(c)
  • D(d)

Step-by-Step Solution

Undo the second fold: twins mirrored across the lower crease. Undo the first: all four mirrored across the middle of the strip. Each shape appears four times in mirror pairs: (b).
Answer: A) (b)

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