A sequence a,,a,,a,,a, a of real numbers is such that Can the arithmetic mean of {a,,a,,a,) be less than -1/2? a, 0,|a₂|a, +1, |a₂|=| a₂ +1,...,a,|=|ª₁ +¹|, |ª₁|=| a₂ +1|

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