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The mean deviation of the series a , a+d...

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

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