OCR Stats 1 2018 December — Question 6

Exam BoardOCR
ModuleStats 1 (Statistics 1)
Year2018
SessionDecember
TopicGeometric Sequences and Series

6 The table shows information about three geometric series. The three geometric series have different common ratios.
First
term
Common
ratio
Number
of terms
Last
term
Series 112\(n _ { 1 }\)1024
Series 21\(r _ { 2 }\)\(n _ { 2 }\)1024
Series 31\(r _ { 3 }\)\(n _ { 3 }\)1024
  1. Find \(n _ { 1 }\).
  2. Given that \(r _ { 2 }\) is an integer less than 10 , find the value of \(r _ { 2 }\) and the value of \(n _ { 2 }\).
  3. Given that \(r _ { 3 }\) is not an integer, find a possible value for the sum of all the terms in Series 3 .