Let S_n be the sum of the first n terms of the series a_1+a_2+\cdots a_n+\cdots. If S_n=n^2+4 n, then the n^{\text{th }} term a_n is

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Let Sn be the sum of the first n terms of the series a1+a2+⋯an+⋯. If Sn=n2+4n, then the n‌th ‌ term an is

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