Prove that (x 1 +... + x n )2 n(x12+..+xn2 ) for all positive integers n and all real numbers x1,...,xn.
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Prove that (x 1 +... + x n )2 n(x12+..+xn2 ) for all positive integers n and all real numbers x1,...,xn.
Prove that (x 1 +... + x n )2 n(x12+..+xn2 )for all positive integers n and all real numbers x1,...,xn.
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