Given that $n$ A.M.'s are inserted between two sets of numbers $a,\;2b$and $2a,\;b$, where $a,\;b \in R$. Suppose further that ${m^{th}}$ mean between these sets of numbers is same, then the ratio $a:b$ equals

  • A

    $n - m + 1:m$

  • B

    $n - m + 1:n$

  • C

    $n:n - m + 1$

  • D

    $m:n - m + 1$

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  • [JEE MAIN 2016]