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Date May 2017 Marks available 3 Reference code 17M.1.SL.TZ1.S_7
Level Standard Level Paper Paper 1 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 ln x 16 , ln x 8 , ln x 4 , 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 log x n = n log x     A1

eg 16 ln x

valid approach to find r     (M1)

eg u n + 1 u n ,   ln x 8 ln x 16 ,   4 ln x 8 ln x ,   ln x 4 = ln x 16 × r 2

r = 1 2     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 » AHL 1.9—Log laws
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