dear sir
please help me out here.
i have got some problem and plese do help me to  find it out its prob
if the length of each word is 4
1101
the answer is 1001 cos mod of 5 is =0;
in 11011 why not the answer 1001 cos it is also the muntiple of  N
and why not the answer of 1101 is 1111 cos bit 1 in the third
position has been changed to 0 after passing throught the noise.
and please sir let me know about the answers of the followring and
please explain why?
1)10011
2)110111
3)00110
4)1111
THE LENGTH OF ALL THESE IS 4