# Big-Oh Proving

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A. Use the definition of big-oh to prove that 3n - 8 - 4n^3 / 2n - 1 is O(n^2).

B. Use the definition of big-oh to prove that 1 . 2 + 2 . 3 + 3 . 4 + ... + (n - 1) . n is O(n3).

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##### Solution Summary

This uses the definition of big-oh in a proof of two questions.

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