IMO Shortlist 1974 problem 4


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2. travnja 2012.
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The sum of the squares of five real numbers a_1, a_2, a_3, a_4, a_5 equals 1. Prove that the least of the numbers (a_i - a_j)^2, where i, j = 1, 2, 3, 4,5 and i \neq j, does not exceed \frac{1}{10}.
Izvor: Međunarodna matematička olimpijada, shortlist 1974