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Four Reals (Posted on 2013-05-10) Difficulty: 2 of 5

If a, b, c, and d are real numbers, then prove that

(a + b + c + d) - (a2 + b2 + c2 + d2) ≤ 1.

See The Solution Submitted by Bractals    
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  Subject Author Date
Easy wayJer2013-05-10 12:05:59
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