SOLUTION: The first term of a geometric series is 3, and the sum of the first term and the second term is 15. What is the sum of the first six terms?
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Question 829923: The first term of a geometric series is 3, and the sum of the first term and the second term is 15. What is the sum of the first six terms?
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The first term of a geometric series is 3, and the sum of the first term and the second term is 15. What is the sum of the first six terms?
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Answer:
3 + 3r = 15
3r = 12
r = 4
The sum of the first 6 terms is equal to
3 + 12 + 48 + 192 + 768 + 3072 =