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12. Prove that, for any integer 2 1n?(n + 1)21² + 2 + 3 + ... + n° =
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12. Prove that, for any integer 2 1n?(n + 1)21² + 2 + 3 + ... + n° =

12. Prove that, for any integer 2 1n?(n + 1)21² + 2 + 3 + ... + n° =-example-1
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