Question: 15. A geometric sequence has a, = 3 and r = 2. Find the sum of the first four terms of the geometric sequence, S4.

15. A geometric sequence has a, = 3 and r = 2. Find the sum of the first four terms of the geometric sequence, S4. 16. Determine whether the infinite geometric series exists (converges) or not(diverges). If it converges, find the sum: 24 + 8 + " + 8 +

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