In a geometric sequence where the first term is and the common ratio is , what is the sum of the first 6 terms ()?
Answer and explanation
Correct answer: D. 315
- Step 1: Use the finite geometric series formula: .
- Step 2: Substitute , , and : .
Answer
315.
Why not the others: '310' computes ; '320' computes ; '305' computes .
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