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If \(S(n)\) is the sum of sequence \(1, 2, 3, 4, \ldots,n,\) in terms of \(n\) and \(S(n), S(2n)=?\)
(A) \(2S(n)\)
(B) \(n\cdot S(n)\)
(C) \(2n\cdot S(n)\)
(D) \(2S(n)+n^2\)
(E) \(S(n)+2n^2\)
Answer: D
Source: GMAT Prep
(A) \(2S(n)\)
(B) \(n\cdot S(n)\)
(C) \(2n\cdot S(n)\)
(D) \(2S(n)+n^2\)
(E) \(S(n)+2n^2\)
Answer: D
Source: GMAT Prep
