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Let Sn be the sum of the first n terms of an arithmetic sequence with first term u1 and common difference d, where u1>d.
S1,S3 and S8 are consecutive terms in a geometric sequence with common ratio r.
Find the value of r.
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It is given that the first term of the arithmetic sequence is 3, and that the sum of the first k terms of the geometric series is greater than 104.
Find the smallest possible value of k.
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