| A | B |
| Arithmetic Series | the expression formed by adding the terms of an arithmetic sequence. |
| Arithmetic Sequence | a sequence in which the difference between consecutive terms is constant. |
| Common Difference | the constant difference between consecutive terms of an arithmetic sequence. |
| Common Ratio | the constant ratio between consecutive terms of a geometric sequence. |
| Finite Sequence | a sequence that has a last term. |
| Geometric Series | the expression formed by adding the terms of a geometric sequence. |
| Geometric Sequence | a sequence in which the ratio of any term to the previous term is constant. |
| Infinite Sequence | a sequence that continues without stopping. |
| Recursive Rule | a rule for a sequence that gives the beginning term or terms of a sequence and then a recursive equation that tells how a(n) is related to one or more preceding terms. |
| Summation Notation | Notation for a series that uses the uppercase Greek letter sigma. |