Dr. J's Maths.com

**Where the techniques of Maths**

are explained in simple terms.

are explained in simple terms.

Sequences & Series - Sigma notation.

Test Yourself 1 - Solutions.

- Algebra & Number
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General interpretation. | 1. | 2. |

3. | 4. | |

5. | 6. | |

Use with arithmetic series. | (i) is an arithmetic series because the model is a linear equation and the common difference is the gradient (i.e. 4). OR The series is 13 + 17 + 21 + ... 61 which has a common difference of 4. So the series is arithmetic. (ii) Hence evaluate this summation. T |
When k = 4, the term is 17 and we have a common difference of 6 (coefficient of the expression after sigma sign). |

Use with geometric series. | ||

16. |