यदि $f(1)=3$, और $f(n+1)-f(n)=3(4^n-1)$ है, तो सभी $n \in N$ के लिए, $f(n)=$

  • A
    $4^n-1$
  • B
    $4^n-5n+4$
  • C
    $4^n-3n+2$
  • D
    $4^n+4n-5$

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