O-LevelMathematicsAlgebra and graphs4024/11 · Oct/Nov 2022 · Q134 Marks
13 (a) The nth term of a sequence is 3n²-1. Find the first three terms of the sequence. (b) These are the first five terms of a different sequence. 1 3 9 27 81. Find an expression, in terms of n, for the nth term of this sequence.
- (a)The nth term of a sequence is 3n²-1. Find the first three terms of the sequence.[2]
- (b)These are the first five terms of a different sequence. 1 3 9 27 81. Find an expression, in terms of n, for the nth term of this sequence.[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2022). The mark or mark type is shown in brackets.
- [2] 2, 11, 26
- B1 for any two correct
- If 0 scored, SC1 for answer -1, 2, 11
- [2] 3ⁿ⁻¹ oe final answer
- B1 for answer 3ᵏ where k is f(n) or for correct answer seen and spoilt
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