જો $n \geq 1$ માટે $I_n = \int x^n \cdot e^{cx} \, dx$ હોય, તો $c \cdot I_n + n \cdot I_{n-1}$ ની કિંમત શોધો.

  • A
    $x^n e^{cx}$
  • B
    $x^n$
  • C
    $e^{cx}$
  • D
    $x^n + e^{cx}$

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