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A DNA chip contains a complete set of random hexanucleotide (6-mers) probes. Out of the 4^6 = 4096 probes, how many will form perfect complementary duplexes with sequences within the single-stranded target DNA, 5'-GAACTGCATTGATA-3'?
Answers: a. 1 b. 3 c. 6 d. 9 e. 12