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A square block of cubes two layers high has one cube missing from the middle of its top layer. How many cubes are left in the block?

Competition practiceDice & Cubes
  • A16
  • B18
  • C9
  • D17

Step-by-Step Solution

A full block 3 by 3 and 2 high has cubes. One is missing from the top layer, so 17 remain.
Answer: D) 17

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