The ratio of sum of $m$ and $n$ terms of an $A.P.$ is ${m^2}:{n^2}$, then the ratio of ${m^{th}}$ and ${n^{th}}$ term will be

  • A

    $\frac{{m - 1}}{{n - 1}}$

  • B

    $\frac{{n - 1}}{{m - 1}}$

  • C

    $\frac{{2m - 1}}{{2n - 1}}$

  • D

    $\frac{{2n - 1}}{{2m - 1}}$

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