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(-) Prove that 1·2 + 2·3 +···+ (n−1) n = (n−1)n(n+ 1) /3. (Discrete Math -...

(-) Prove that 1·2 + 2·3 +···+ (n−1) n = (n−1)n(n+ 1) /3. (Discrete Math - Mathematical Induction)

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