Question 5
The third term of a geometric progression is 18 and the sum of the first three terms is 26. It is given that the common ratio is negative.
**(b)** Find the exact value of the sum to infinity of the progression.
(In part (a) you found $a = 32$ and $r = -\frac{3}{4}$.)
**(b)** Find the exact value of the sum to infinity of the progression.
(In part (a) you found $a = 32$ and $r = -\frac{3}{4}$.)
