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### Algebraic Permutations and Combinations

In algebra, you use permutations to count the number of subsets of a larger set. Use permutations when order is necessary. With combinations, you can count the number of subsets when order doesn't matter [more…]

### Using Algebra to Find the Sums of Sequences

Algebra can help you add a series of numbers (the sum of sequences) more quickly than you would be able to with straight addition. Adding integers, squares, cubes, and terms in an arithmetic or geometric [more…]

### 9 Number Systems in Algebra to Know

A *number system* in algebra is a set of numbers — and different number systems are used to solve different types of algebra problems. Number systems include real numbers, natural numbers, whole numbers, [more…]

### Algebraic Combinations

Combinations are another way of counting items. This time, you select some items from a larger group, but you don’t care what order they come in. For instance, if you select 6 lottery numbers from a listing [more…]