Question: It's a question about Hamming(7,4) code. Let d= d1d2d3d4d5d6d7 be a valid codeword of Hamming (7,4) code. Suppose a= a1a2a3a4a5a6a7 be another codeword that differs

It's a question about Hamming(7,4) code.

Let d= d1d2d3d4d5d6d7 be a valid codeword of Hamming (7,4) code. Suppose a= a1a2a3a4a5a6a7 be another codeword that differs from d precisely at two bits. Show that the codeword a cannot be a valid codeword.

I wonder what could be a good problem solving process.

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