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[" Mean deviation of the series a,a+d,a "],[2d,-" - "a+2nd" from its mean is "],[[" 1) "((n+1)d)/((2n+1))," 2) "(nd)/(2n+1)],[" 3) "((2n+1)d)/(n(n+1))," 4) "(n(n+1)d)/(2n+1)]]

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