Hey guys, I don’t get why the answer is A in this question. Why does the order matter?
It’s because 4 nucleotides can come at every single digit.
First letter: A, T , G, C possible = 4
Second letter: A, T , G, C possible = 4
Third letter: A, T , G, C possible = 4, an so forth.
Therefore all combos will be 4 * 4 * … * 4 = 4^7.
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