I can be found in classrooms, sometimes in groups of three, but never alone. What am I?

Category: Math · Difficulty: expert

Hint: Consider a specific relationship in geometry.

Answer

The Pythagorean triples

Explanation

Pythagorean triples are sets of three positive integers a, b, and c, satisfying a² + b² = c².

This is a expert math riddle — one of the harder riddles here. The answer is The Pythagorean triples.

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