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What is the minimal Hamming distance between any two correct codewords?

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What is the minimal Hamming distance between any two correct codewords?

(a) 1

(b) 2

(c) 3

(d) 4

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This question is from Checksum, Complexity Classes & NP Complete Problems in division Checksum, Complexity Classes & NP Complete Problems of Data Structures & Algorithms II

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The correct option is (c) 3

To explain: Since we use a generalized version of Hamming(7, 4) code, the minimal hamming distance is 3. It cannot correct burst errors.

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