O-LevelMathematicsAlgebra and graphs4024/11 · Oct/Nov 2020 · Q184 Marks
Some numbers are arranged in rows. Each row contains one more number than the previous row. The numbers in each row are two more than the numbers in the previous row. Row 1 | 3 3 Row 2 | 5 5 5 Row 3 | 7 7 7 7 Row 4 | 9 9 9 9 9 Row 5 |
- (a)Complete Row 5.[1]
- (b)Write down an expression, in terms of n, for each number in Row n.[1]
- (c)Write down an expression, in terms of n, for the number of numbers in Row n.[1]
- (d)Write down an expression, in terms of n, for the sum of the numbers in Row n.[1]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2020). The mark or mark type is shown in brackets.
- [1] 11 11 11 11 11 11
- [1] 2n + 1 oe final answer
- [1] n+1 oe final answer
- [1] (2n + 1)(n + 1); or 2n² + 3n + 1 oe
- FT their (b) × their (c) provided both answers are in terms of n
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