are you sure about your answer? cuz: an = 6an-1 - 9an-1, then a2 is: a2 = 6a1 - 9a0 = 6(12)-9(5) = 27. but  when i use your formula for n = 2: a2 = (5-2)3(2)= 18, do you have an explination?

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