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Question
For a particular tube, among six harmonic frequencies below 1000 Hz, only four harmonic frequencies are given: 300 Hz, 600 Hz, 750 Hz and 900 Hz. What are the two other frequencies missing from this list?
Options
100 Hz, 150 Hz
150 Hz, 450 Hz
450 Hz, 700 Hz
700 Hz, 800 Hz
Solution
150 Hz, 450 Hz
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