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On a standard die the dots on opposite faces always add up to 7. Which of the dice (a) to (d) can NOT be a standard die?

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

Step-by-Step Solution

Two faces that add up to 7 are opposite each other, so they can never be seen together. Die (c) shows 5 and 2 side by side ; every other die shows three faces with no pair adding to 7.
Answer: C) (c)

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