O-LevelMathematicsAlgebra and graphs4024/12 · May/June 2020 · Q174 Marks
Here are the first four terms of a number sequence. T₁ = 1² + 3 = 4 T₂ = 2² + 8 = 12 T₃ = 3² + 13 = 22 T₄ = 4² + 18 = 34
- (a)Find T₅.[1]
- (b)Find an expression, in terms of n, for Tₙ.[3]
Mark scheme
Marking points from the official mark scheme (May/June 2020). The mark or mark type is shown in brackets.
- [1] 48
- [3] n² + 5n - 2 oe final answer
- B2 for answer n² + 5n + k oe or for 5n - 2 oe seen
- or B1 for answer n² + an + b or for 5n + k oe seen
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