A geometric sequence has first term aaa and common ratio rrr, where r>0r > 0r>0.
Given that
Show that r=0.75r = 0.75r=0.75.
Hence find the value of aaa.
Given that the sum of the first nnn terms of this sequence is greater than 63.5
Find the smallest possible value of nnn.
(Solutions based entirely on graphical or numerical methods are not acceptable.)
Practise Edexcel A Level Maths 3.4 Geometric Series with exam-style questions for A Level Maths. 27 questions, matched to the Edexcel A Level Maths (9MA0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.