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Question
The probability that a single bit will be in error on a typical public telephone line using 4800 bps modem is 10 to the power -3. If no error detection mechanism is used, the residual error rate for a communication line using 9-bit frames is approximately equal to
Options:
A .  0.999
B .  0.003
C .  0.009
D .  None of these
E .  0.991
Answer: Option C

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