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Two opposite corners of a square sheet, top-left and bottom-right, are folded in to the centre, and then the sheet is folded along the diagonal from top-left to bottom-right, lower-left half up. Three round holes are punched as shown. Which figure shows the opened sheet?

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

Step-by-Step Solution

Undo the diagonal fold: every hole gets a twin across that diagonal. Undo the corner folds: the holes lying on a corner flap get one more twin, out in that corner. Ten holes: (b).
Answer: A) (b)

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