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The filters $F1$ and $F2$ having characteristics as shown in Figures $(a)$ and $(b)$ are connected as shown in Figure $(c)$.

The cut-off frequencies of $F1$ and $F2$ are $f_{1}$ and $f_{2}$ respectively. If $f_{1} < f_{2}$, the resultant circuit exhibits the characteristic of a

  1. Band-pass filter
  2. Band-stop filter
  3. All pass filter
  4. High-Q filter
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