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Q)

If the mean deviation of the numbers $1, 1+ d, ..., 1+100d$ from their mean is $255$, then a value of $d$ is :

$\begin{array}{1 1}(1) 10.1 \\ (2) 20.2 \\ (3) 10 \\ (4) 5.05 \end{array} $

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