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Date November 2016 Marks available 3 Reference code 16N.1.SL.TZ0.T_13
Level Standard Level Paper Paper 1 (with calculator from previous syllabus) Time zone Time zone 0
Command term Determine Question number T_13 Adapted from N/A

Question

A comet orbits the Sun and is seen from Earth every 37 years. The comet was first seen from Earth in the year 1064.

Find the year in which the comet was seen from Earth for the fifth time.

[3]
a.

Determine how many times the comet has been seen from Earth up to the year 2014.

[3]
b.

Markscheme

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

1064 + ( 5 1 ) × 37    (M1)(A1)

 

Note:     Award (M1) for substituted arithmetic sequence formula, (A1) for correct substitution.

 

= 1212    (A1)     (C3)

[3 marks]

a.

2014 > 1064 + ( n 1 ) × 37    (M1)

 

Note:     Award (M1) for a correct substitution into arithmetic sequence formula.

Accept an equation.

 

( n < )   26.6756    (A1)

26 (times)     (A1)     (C3)

 

Note:     Award the final (A1) for the correct rounding down of their unrounded answer.

 

OR

2014 > 1064 + 37 t    (M1)

 

Note:     Award (M1) for a correct substitution into a linear model (where t = n 1 ).

Accept an equation or weak inequality.

Accept 2014 1064 37 for     (M1).

 

( t < )   25.6756    (A1)

 

26 (times)     (A1)     (C3)

 

Note:     Award the final (A1) for adding 1 to the correct rounding down of their unrounded answer.

 

[3 marks]

b.

Examiners report

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

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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