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If the mean deviation of the numbers 1,"...

If the mean deviation of the numbers `1,""1""+""d ,""1""+""2d ,""..."",""1""+""100 d` from their mean is 255, then the d is equal to (1) 10.0 (2) 20.0 (3) 10.1 (4) 20.2

A

`10.1`

B

` 20.2`

C

` 10.0`

D

` 20.0`

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