a(n) = 3*3^(n-1).
Step-by-step explanation:
The first term of this sequence is 3. The next one is 3 times 3, or 9; the next is 3 times 9, or 27; and so on. So the common ratio is 3.
The formula for the nth term is thus a(n) = 3*3^(n-1).
Step-by-step explanation: