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Which of the cubes (a) to (d) CAN be made by folding the staircase net shown?

Competition practiceDice & Cubes
  • A(a)
  • B(b)
  • C(c)
  • D(d)

Step-by-Step Solution

Squares two steps apart along the staircase are opposite: D–L, H–S and F–N. (c) shows H beside S and (d) shows N beside F, so they are impossible. (a) shows D, N and H, which meet at a corner, but going round the opposite way to the net, so it is a mirror image. (b) fits.
Answer: B) (b)

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