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All four corners of a square sheet are folded in to meet at the centre, like an envelope. Holes are punched through three of the corner flaps: round, square and diamond. Which figure shows the opened sheet?

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

Step-by-Step Solution

Each flap opens back to its own corner, so each hole gets one twin mirrored across that flap's slanting crease, out towards that corner. The fourth corner was not punched and has no hole: (b).
Answer: B) (b)

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