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The top-right and bottom-left corners of a square sheet are folded in to touch the centre. A diamond is punched through one flap, a round hole through the other, and a square hole where the paper is single. Which figure shows the sheet opened?

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

Step-by-Step Solution

Each flap opens back to its own corner, so each flap's hole gets a twin mirrored across that flap's slanting crease, out towards the corner. The square hole has no twin: five holes, (a).
Answer: B) (a)

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