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Standard deviation of the first 2n+1 nat...

Standard deviation of the first 2n+1 natural numbers is equal to

A

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

B

`sqrt((n(n+1)(2n+1))/(3))`

C

`sqrt((n(+1))/(3))`

D

`sqrt((n(n-1))/(2))`

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