A transistor amplifier has poles at
s₁ = - 0.000245 x 10⁹ rad/sec.
s₂ = - 0.0748 x 10⁹ rad/sec.
s₃ = - 0.670 x 10⁹ rad/sec.
s₄ = - 4.38 x 10⁹ rad/sec.
The upper 3 dB frequency of the amplifier will be

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