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Multiple choice

The mean deviation from mean of the observation $a,\ a+d,\ a+2d,....,a+2nd$ is

  1. $\dfrac {n(n+1)d^{2}}{3}$
  2. $\dfrac {n(n+1)}{2}d^{2}$
  3. $a+\dfrac {n(n+1)d^{2}}{2}$
  4. $None\ of\ these$
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