Mean deviation of the series \( a, a+d, a+2 d, \ldots \ldots \) \( a+2 \) nd from its mean is....

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Mean deviation of the series \( a, a+d, a+2 d, \ldots \ldots \)
\( \mathrm{P} \)
\( a+2 \) nd from its mean is
W
(1) \( \frac{(n+1) d}{(2 n+1)} \)
(2) \( \frac{n d}{2 n+1} \)
(3) \( \frac{n(n+1) d}{(2 n+1)} \)
(4) \( \frac{(2 n+1) d}{n(n+1)} \)
.


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