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GATE ECE 2008 | Question-69

Consider the frequency modulated signal $10 \cos \left[2 \pi \times 10^{5} t+5 \sin (2 \pi \times 1500 t)+7.5 \sin (2 \pi \times 1000 t)\right]$ with carrier frequency of $10^{5} \mathrm{~Hz}$. The modulation index is

  1. $12.5$
  2. 10
  3. $7.5$
  4. $5$
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