Question: How many 5-element DNA sequences a) end with A? b) start with T and end with G? c) contain only A and T? d) do

How many 5-element DNA sequences
a) end with A?
b) start with T and end with G?
c) contain only A and T?
d) do not contain C?
Hint: Recall that a DNA sequence is a sequence of letters, each of which is one of A, C, G, or T. Thus by the product
rule there are 4^5 = 1024 DNA sequences of length five if we impose no restrictions.
discrete math
discrete structures

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