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Question 1
The mean deviation from the mean of the AP a, a + d, a + 2d, ..., a + 2nd, is:
A.
$\frac{n}{n+1} \, d$
B.
$\frac{n}{2n+1} \, d$
C.
$\frac{n+1}{2n+1} \, d$
D.
$\frac{n(n+1)}{2n+1} \, d$
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