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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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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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Apr 15, 2017
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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?
Mathematics
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Macabeus
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Macabeus
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Hello,
==> 1+r=5==>r=4
3+3r+3r²+3r^3+...+3r^6=3(1+r+r²+...+r^6)=3*(r^7-1)/(r-1)=4^7-1=16383
Robert Ramey
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Apr 20, 2017
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Robert Ramey
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