| n | \(a_{n+1}-\alpha=r(a_n-\alpha)\) |
| 1 | \(a_{2}-\alpha=r(a_1-\alpha)\) |
| 2 | \(a_{3}-\alpha=r(a_2-\alpha)=r^2(a_1-\alpha)\) |
| 3 | \(a_{4}-\alpha=r(a_3-\alpha)=r^3(a_1-\alpha)\) |
| 4 | \(a_{5}-\alpha=r(a_4-\alpha)=r^4(a_1-\alpha)\) |
| … | … |
| n-1 | \(a_{n}-\alpha=r(a_{n-1}-\alpha)=r^{n-1}(a_1-\alpha)\) |