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Arithmetic Sequenceshard
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An arithmetic sequence is defined by an=a1+(n−1)da_n = a_1 + (n-1)dan​=a1​+(n−1)d. If ∑k=1nak=n2+3n\sum_{k=1}^n a_k = n^2 + 3n∑k=1n​ak​=n2+3n, what is the expression for the nthn^{th}nth term ana_nan​?