Date | May 2017 | Marks available | 3 | Reference code | 17M.1.SL.TZ1.S_7 |
Level | Standard Level | Paper | Paper 1 (without calculator) | Time zone | Time zone 1 |
Command term | Find | Question number | S_7 | Adapted from | N/A |
Question
The first three terms of a geometric sequence are lnx16, lnx8, lnx4, for x>0.
Find the common ratio.
Markscheme
* This question is from an exam for a previous syllabus, and may contain minor differences in marking or structure.
correct use logxn=nlogx A1
eg16lnx
valid approach to find r (M1)
egun+1un, lnx8lnx16, 4lnx8lnx, lnx4=lnx16×r2
r=12 A1 N2
[3 marks]
Examiners report
[N/A]