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The bandwidth of an n-stage tuned amplifier, with each stage having a band width of $B$, is given by

1. $\mathrm{B} / n$
2. $\mathrm{B} / \sqrt{n}$
3. $B \sqrt{2^{1 / n}-1}$
4. $\mathrm{B} / \sqrt{2^{1 / n}-1}$