If the coefficients of the three consecutive terms in the expansion of $(1+ x )^{ n }$ are in the ratio $1: 5: 20$, then the coefficient of the fourth term is $............$.

  • [JEE MAIN 2023]
  • A

    $3654$

  • B

    $1827$

  • C

    $5481$

  • D

    $2436$

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  • [AIEEE 2002]