यदि $n \geq 1$ के लिए $I_n = \int x^n \cdot e^{cx} \, dx$ है, तो $c \cdot I_n + n \cdot I_{n-1}$ का मान ज्ञात कीजिए।

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

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