{(3^n+2)-(3^n+1)}÷{(7×3^n+1)+(5×3^n)}
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Answer:
( 3^n+2 - 3^n+1 )/( 7*3^n+1 + 5*3^n)
= 3^n(3²-3)/3^n(7*3+5)
=(9-3)/(21+5)
=6/26
=3/13
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