Variance of the first n natural numbers or the first n even numbers

1. A.
   $\frac{n(n+1)}{2}$
2. B.
   $\frac{(n+1)(n+5)}{12}$
3. C.
   $\frac{(n+1)(n-5)}{12}$
4. D.
   $\frac{n^2-1}{12}$

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1. A.
   833
2. B.
   473
3. C.
   4374
4. D.
   8334

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1. A.
   $\frac{n^2-1}{12}$
2. B.
   $\frac{(n-1)^2}{12}$
3. C.
   $\frac{n^2}{12}-1$
4. D.
   $\frac{n^2-1}{12}$

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1. A.
   $\frac{4n^2+1}{12}$
2. B.
   $\frac{(2n-1)^2}{12}$
3. C.
   $\frac{n^2}{3}-1$
4. D.
   $\frac{4n^2-1}{12}$

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