Let $f(n)=A(-2)^n+B(-3)^n$ for all $A, B \in \mathbb{R}$ and $n \in \mathbb{N}-\{1, 2\}$. If $f(n)+a f(n-1)+b f(n-2)=0$,then $(a+b)(b-a)=$

  • A
    $0$
  • B
    $5$
  • C
    $7$
  • D
    $11$

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