Asked by john
The sum of the first 5 terms of a GP is 61. If the 5th term is 81 solve the value of the common ratio.
Answers
Answered by
Steve
just solve the system
a(r^5-1)/(r-1) = 61
ar^4 = 81
Hint: 81 = 3^4
a(r^5-1)/(r-1) = 61
ar^4 = 81
Hint: 81 = 3^4
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