Question

`120` identical spheres are arranged in the shape of a triangular pyramid. How many layers are there in the pyramid?

Note: This is a pyramid, which is a three-dimensional shape, and not a triangle in a plane.

Difficulty level (1 very easy - 10 very hard): 1

Topics:
Geometry -> Solid Geometry / Geometry in Space Arithmetic Logic -> Reasoning / Logic Proof and Example -> Constructing an Example / Counterexample Algebra -> Sequences -> Arithmetic Progression / Arithmetic Sequence Algebra -> Sequences -> Complete/Continue the Sequence Number Theory -> Triangular Numbers
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