Question: Problem 2 . The DNA can be represented by a string of characters { A , C , G , T } . ( i

Problem 2. The DNA can be represented by a string of characters {A, C, G, T }.
(i) How many sequences of length n can we have with these 4 characters?
(ii)* How many sequences of these characters are there that have size n >4 in which the character T appears exactly 4 times

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