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1. 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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