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Date November 2018 Marks available 3 Reference code 18N.2.AHL.TZ0.H_1
Level Additional Higher Level Paper Paper 2 Time zone Time zone 0
Command term Find Question number H_1 Adapted from N/A

Question

Consider a geometric sequence with a first term of 4 and a fourth term of −2.916.

Find the common ratio of this sequence.

[3]
a.

Find the sum to infinity of this sequence.

[2]
b.

Markscheme

* This question is from an exam for a previous syllabus, and may contain minor differences in marking or structure.

u4=u1r32.916=4r3u4=u1r32.916=4r3      (A1)

solving, r=0.9r=0.9      (M1)A1

 

[3 marks]

a.

S=41(9)S=41(9)      (M1)

=4019(=2.11)=4019(=2.11)     A1

 

[2 marks]

b.

Examiners report

[N/A]
a.
[N/A]
b.

Syllabus sections

Topic 1—Number and algebra » SL 1.3—Geometric sequences and series
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Topic 1—Number and algebra » AHL 1.11—Sum of infinite geometric sequences
Topic 1—Number and algebra

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