Keshuv19 Posted July 22, 2013 Report Share Posted July 22, 2013 Hi guys, Can you please help me with this question and explain to me the method of workout as i find it really confusing to get to the answer . Here is the question :The sum of the first three terms of a geometric sequence is 62.755, and the sum of the infinite sequence is 440. Find the common ratioThnxKeshuv 19 Reply Link to post Share on other sites More sharing options...
Keshuv19 Posted July 22, 2013 Author Report Share Posted July 22, 2013 (edited) The Answer I got was 1.047; although I took r>1. Does this really matter ? The answer changes when doing it in the inverse direction, i.e. r<1 , r =0.952.Thnx again Edited July 22, 2013 by Keshuv19 Reply Link to post Share on other sites More sharing options...
Keshuv19 Posted July 22, 2013 Author Report Share Posted July 22, 2013 Another question... Please Help ! Thnx Given that Cos x = 2a+14/(14(a^2)+280)^1/2. Find the value of a for which x= 1.2 rad.Thnx again Reply Link to post Share on other sites More sharing options...
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