(i)[2]
Since the progression is geometric, determine the sum to infinity.
(ii)[3]
If the progression is arithmetic instead, determine the number of terms when the sum of all the terms is $0$.
Mathematics 9709 · AS & A Level · Series
Since the progression is geometric, determine the sum to infinity.
If the progression is arithmetic instead, determine the number of terms when the sum of all the terms is $0$.
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Applies a method to determine $r$ and $S_\infty$, with $|r|<1$” …