Paper 2 Higher - Sample Assessment Q3 Answers
3) Here are the first four terms of an arithmetic sequence.
6, 10, 14, 18
(a) Write an expression, in terms of n, for the nth term of this sequence.
(2 marks)
The nth term of a different arithmetic sequence is 3n + 5
(b) Is 108 a term of this sequence? Show how you get your answer.
(2 marks)
(Total for Question 3 is 4 marks)
Answers
Question |
Answer |
Notes |
3 a |
4n + 2 |
M - start to deduce nth term from information given eg 4n+k where k ≠ 2 A1 - cao |
3 b |
No (supported) |
M1 - starts method that could lead to a deduction eg uses inverse operations C1 - or a convincing argument eg 34 is 107 so NO; (108−5)÷3 is not an integer |