题目
Problem
A geometric progression is such that its second term is and its sum to infinity is 160.
(a) Find the common ratio.
[4]
(b) The first nine terms of the progression are now removed.
Find the sum to infinity of the remaining terms of the progression.
[3]
题目中文翻译
一个等比数列的第二项为 ，其无穷和为 160。
(a) 求公比。
[4]
(b) 现在去掉该数列的前九项。
求剩余项的无穷和。
[3]