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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]

Syllabus sections

Topic 1—Number and algebra » SL 1.3—Geometric sequences and series
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Topic 1—Number and algebra

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