If $c_0, c_1, c_2, \ldots, c_n$ denote the coefficients in the expansion of $(1+x)^n$, then the value of $c_1 + 2c_2 + 3c_3 + \ldots + nc_n$ is

  • A
    $n \cdot 2^{n-1}$
  • B
    $(n+1) 2^{n-1}$
  • C
    $(n+1) 2^n$
  • D
    $(n+2) 2^{n-1}$

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