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A 33.33% duty cycle rectangular wave is fed to the input of an Spectrum Analyzer. What will be observed?
$$ 2^{nd}, 5^{th}, 8^{th} .............$$ harmonics missing
$$ 3^{rd}, 6^{th}, 9^{th} .............$$ harmonics missing
$$ 1^{st}, 4^{th}, 7^{th} .............$$ harmonics missing
All the harmonic present
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