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The S.D of the first n natural numbers ...

The S.D of the first n natural numbers is

A

`(n+1)/2`

B

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

C

`sqrt(((n^2-1))/12`

D

none of these

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The correct Answer is:
C
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PATHFINDER-STATISTICS AND MATHEMATICAL REASONING-QUESTION BANK
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  7. Which of the following is true?

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