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If the number of bits per sample in a $\text{PCM}$ system is increased from improvement in signal-to quantisation noise ratio will be

  1. $3 \mathrm{~d B}$
  2. $6  \mathrm{~d B}$
  3. $2 n  \mathrm{~d B}$
  4. $0  \mathrm{~d B}$
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