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When a square sheet is folded along the diagonal from top-left to bottom-right, lower-left half upward, and three round holes are punched, which figure shows the result after opening?

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

Step-by-Step Solution

Each hole is mirrored across the diagonal, swapping its distance from the left edge with its distance from the top edge: (3, 1) goes to (1, 3) and so on. That is (d).
Answer: A) (d)

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