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At a given probability of error, binary coherent $\text{FSK}$ is inferior to binary coherent $\text{PSK}$ by

  1. $6 \mathrm{~dB}$
  2. $3 \mathrm{~dB}$
  3. $2 \mathrm{~dB}$
  4. $0 \mathrm{~dB}$
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