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For the arithmetic progression a,(a+d),(...

For the arithmetic progression `a,(a+d),(a+2d),(a+3d),......,(a+2nd)`, the mean deviation from mean is

A

`(n(n+1)d)/(2n-1)`

B

`(n(n+1)d)/(2n+1)`

C

`(n(n-1)d)/(2n+1)`

D

`((n+1)d)/(2)`

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