Let $A$ be set of numbers. Prove that if * operation is associative for any $3$ elements from $A$, the operation is associative for any $n$ elements from $A$, too.
Intuitively, this can be proved by the method of Mathematical Induction, but I don't know how to go further after inductive step.
2026-03-25 19:05:24.1774465524
How to complete the proof of the theorem about associative property?
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