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The sequence \(a_1, a_2, a_3, \ldots, a_n\) of \(n\) integers is such that \(a_k=k\) if \(k\) is odd, and \(a_k=-a_{k-1}\) if \(k\) is even. Is the sum of the terms in the sequence positive?
(1) \(n\) is odd.
(2) \(a_n\) is positive.
Answer: D
Source: GMAT Prep
(1) \(n\) is odd.
(2) \(a_n\) is positive.
Answer: D
Source: GMAT Prep
