Question: How many 7-element RNA sequences (i.e., 7-letter strings using characters A, U, C, G) are there that (a) do not contain G? (b) either start

How many 7-element RNA sequences (i.e., 7-letter strings using characters A, U, C, G) are there that

(a) do not contain G?

(b) either start with A or end with C?

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