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Competitive Stats
Q40Section I (Objective (Q1–Q80))40 of 80

Statistics — mean of a numerical sequence

What is the mean of the numbers 1⋅n2,2⋅(n−1)2,3⋅(n−2)2,…,n⋅121\cdot n^2, 2\cdot(n-1)^2, 3\cdot(n-2)^2,\dots,n\cdot1^2?

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