If the mean deviation about the mean of the numbers $1,2,3, \ldots ., n$, where $n$ is odd, is $\frac{5(n+1)}{n}$, then $n$ is equal to

  • [JEE MAIN 2022]
  • A

    $20$

  • B

    $25$

  • C

    $23$

  • D

    $21$

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  • [JEE MAIN 2023]

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