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Date November 2017 Marks available 2 Reference code 17N.1.SL.TZ0.S_2
Level Standard Level Paper Paper 1 Time zone Time zone 0
Command term Find Question number S_2 Adapted from N/A

Question

In an arithmetic sequence, the first term is 8 and the second term is 5.

Find the common difference.

[2]
a.

Find the tenth term.

[2]
b.

Find the sum of the first ten terms.

[2]
c.

Markscheme

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

subtracting terms     (M1)

eg 5 8 ,   u 2 u 1

d = 3     A1     N2

[2 marks]

a.

correct substitution into formula     (A1)

eg u 10 = 8 + ( 10 1 ) ( 3 ) ,   8 27 ,   3 ( 10 ) + 11

u 10 = 19     A1     N2

[2 marks]

b.

correct substitution into formula for sum     (A1)

eg S 10 = 10 2 ( 8 19 ) ,  5 ( 2 ( 8 ) + ( 10 1 ) ( 3 ) )

S 10 = 55     A1     N2

[2 marks]

c.

Examiners report

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

Syllabus sections

Topic 1—Number and algebra » SL 1.2—Arithmetic sequences and series
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Topic 1—Number and algebra

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