Mathematics · Visual Reasoning
A solid stack of identical cubes is arranged in a 3D step-like pyramid structure. The bottom layer has 3 rows of 3 cubes (9 cubes), the middle layer has 2 rows of 3 cubes (6 cubes) placed directly on the back part, and the top layer has 1 row of 3 cubes (3 cubes) at the very back. If the entire structure is solid with no hollow spaces underneath, what is the total number of cubes in this arrangement?
- 117
- 216
- 324✓
- 418
Correct answer
24
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