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RMO Inequalities - 3

Algebra Level 2

Let \(a,b,c,d\) be four reals such that \(a+b+c+d=1\). What is the minimum value of \((a^2+b^2+c^2+d^2) ?\)

Try part 1 here and part 2 here

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by Sravanth Chebrolu

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