The mean deviation from the mean of the AP a, a + d, a + 2d, ..., a + – McqOptions

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

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