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Date November 2019 Marks available 2 Reference code 19N.1.SL.TZ0.S_1
Level Standard Level Paper Paper 1 (without calculator) Time zone Time zone 0
Command term Find Question number S_1 Adapted from N/A

Question

In an arithmetic sequence,  u 2 = 5 and  u 3 = 11 .

Find the common difference.

[2]
a.

Find the first term.

[2]
b.

Find the sum of the first 20 terms.

[2]
c.

Markscheme

valid approach          (M1)

eg    11 5 11 = 5 + d

d = 6              A1  N2

[2 marks]

a.

valid approach          (M1)

eg    u 2 d 5 6 u 1 + ( 3 1 ) ( 6 ) = 11

u 1 = 1             A1  N2

[2 marks]

b.

correct substitution into sum formula

eg    2022(1)+19(6) 20 2 ( 1 + 113 )         (A1)

S 20 = 1120            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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