Let {an} be an equal ratio sequence with common ratio Q (q is not equal to 1), and Sn be the sum of its first n terms, then the sum of the first terms of the sequence {1 / an} is?

So s = Sn / (A1 * an)

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1. In the known arithmetic sequence {an}, Sn is the sum of the first n terms. If S16 ＞ 0 and S17 ＜ 0, then when SN is the largest, the value of n is () A. 16B. 9C. 8D. 10
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