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[" 7.The mean deviation of the series "a...

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

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