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Mean deviation of the series a,a+d,a+2d,...

Mean deviation of the series `a,a+d,a+2d,.......,a+2nd` from its mean is (a) `((n+1)d)/((2n+1))` (b) `(nd)/(2n+1)` (c) `((2n+1)d)/(n(n+1))` (d) `(n(n+1)d)/(2n+1)`

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