If $19^{th}$ terms of non -zero $A.P.$ is zero, then its ($49^{th}$ term) : ($29^{th}$ term) is

  • [JEE MAIN 2019]
  • A

    $4 : 1$ 

  • B

    $1 : 3$ 

  • C

    $3 : 1$ 

  • D

    $2 : 1$ 

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  • [JEE MAIN 2019]