# Doubt

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Given a binary string , in which direction should we place the parity bits , starting from left to right or right to left? Does both give same result

Ex : Data is 1001

1. P1 P2 1 P4 0 0 1

Which is correct?

## Related questions

1
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It is necessary to formulate the hamming code for four data bits $D _3, D _5, D _6 and D _7$ together with three parity bits $P _1, P _2 and P _3$ ... to include the double bit error detection in the code. Assume that error occurs in the bit $D _5 and P _2$. Show how the error is detected.