J JiminPark Oct 2015 1 0 Australia Oct 12, 2015 #1 How many terms of the geometric sequence 1.2, 2.4, 4.8, 9.6, 19.2...are required for the sum to be greater than 10,000? Do you use the equation sn=a(1-r^n)/1-r? And how is logarithms included in this question?

How many terms of the geometric sequence 1.2, 2.4, 4.8, 9.6, 19.2...are required for the sum to be greater than 10,000? Do you use the equation sn=a(1-r^n)/1-r? And how is logarithms included in this question?

P Plato MHF Helper Aug 2006 22,458 8,632 Oct 12, 2015 #2 JiminPark said: How many terms of the geometric sequence 1.2, 2.4, 4.8, 9.6, 19.2...are required for the sum to be greater than 10,000? Do you use the equation sn=a(1-r^n)/1-r? And how is logarithms included in this question? Click to expand... Please supply some samples of your own efforts so that we may help you. Hint: use \(\displaystyle \log_{10} \) because \(\displaystyle {S_n} > 10^5 \) .

JiminPark said: How many terms of the geometric sequence 1.2, 2.4, 4.8, 9.6, 19.2...are required for the sum to be greater than 10,000? Do you use the equation sn=a(1-r^n)/1-r? And how is logarithms included in this question? Click to expand... Please supply some samples of your own efforts so that we may help you. Hint: use \(\displaystyle \log_{10} \) because \(\displaystyle {S_n} > 10^5 \) .

H HallsofIvy MHF Helper Apr 2005 20,249 7,909 Oct 12, 2015 #3 You want \(\displaystyle S_n> 10^4= 10,000\).