If the sum of first $n$ terms of an $A.P.$ be equal to the sum of its first $m$ terms, $(m \ne n)$, then the sum of its first $(m + n)$ terms will be

  • A

    $0$

  • B

    $n$

  • C

    $m$

  • D

    $m + n$

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  • [IIT 1995]