O-LevelMathematicsAlgebra and graphs4024/12 · May/June 2021 · Q204 Marks
Here are the first four terms of a sequence. 12/16 17/25 22/36 27/49 Find an expression for the nth term of the sequence.
Mark scheme
Marking points from the official mark scheme (May/June 2021). The mark or mark type is shown in brackets.
- [4] (5n+7) / (n+3)² oe final answer
- [4] B2 for nth term for numerator sequence 5n + 7 oe final answer or B1 for 5n + k oe seen
- [4] AND B2 for nth term for denominator sequence (n + 3)² oe final answer or B1 for quadratic expression in n seen for denominator sequence
- [4] Maximum 3 marks if final answer incorrect
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