3^n + 9^n+1/3^n-1 ×9^n-1
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3n+9n+1/3n-1*9n-1
12n+1/3-1*9n-1
4n+1-1*9n-1
5n-1*9n-1
4n*9n-1
36n-1
35n is the answer
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