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A sequence of real numbers a(1), a(2), a...

A sequence of real numbers `a_(1), a_(2), a_(3),......a_(n+1)` is such that `a_(1)=0, |a_(2)|=|a_(1)+1|, |a_(3)|=|a_(2)+1|` Then `(a_(1)+a_(2)+.........+a_(n))/(n)` cannot be equal to.

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