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Let $G(x)$ be the generator polynomial used for CRC checking. What is the condition that should be satisfied by $G(x)$ to detect odd number of bits in error?

  1. $G(x)$ contains more than two terms
  2. $G(x)$ does not divide $1+x^k$, for any $k$ not exceeding the frame length
  3. $1+x$ is a factor of $G(x)$
  4. $G(x)$ has an odd number of terms.
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ans c)
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G(x) contains more than two terms = No meaning here
If 1+x is factor of generator polynomial then we can find all odd number of error. So B is true.
To detect 1 bit error we need xk +1. where k is any constant.

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