12^n / 2^(2n-1)*3(n+1) = 12^n / (2^2n/2)*3*3^n = 12^n / (4^n/2)*3*3^n = 2/3 * 12^n /12^n = 2/3
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12^n / 2^(2n-1)*3(n+1) = 12^n / (2^2n/2)*3*3^n = 12^n / (4^n/2)*3*3^n = 2/3 * 12^n /12^n = 2/3