Past Papers’ Solutions | Edexcel | AS & A level | Mathematics | Core Mathematics 1 (C1-6663/01) | Year 2005 | June | Q#9

  Question An arithmetic series has first term  and common difference . a)   Prove that the sum of the first n terms of the series is Sean repays a loan over a period of  months. His monthly repayments form an arithmetic sequence. He repays £149 in the first month, £147 in the second month, £145 in the third month, […]