In English we use the word combination loosely, without thinking if the order of things is important. In other words:

Find out how many different ways to choose items. For an in-depth explanation of the formulas please visit Combinations and Permutations.

Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K-12 kids, teachers and parents.

Combinations and Permutations. Combinations and Permutations Calculator.

Data is a collection of facts and numbers. Probability tells us how likely something is to happen. Statistics is like detective work to find...

Just type and your answer comes up live. Use the buttons, or type formulas like 3sqrt (2) or pi/2. Also see Function Grapher, Equation Grapher,...

A Partial Sum is a Sum of Part of a Sequence. This is the Sequence of even numbers from 2 onwards: 2, 4, 6, 8, 10, 12, ...

Here are some really useful applications to speed your way to that all-important solution.

Solving means finding missing sides and angles. When we know any 3 of the sides or angles ... we can find the other 3.

Math is Fun Curriculum for High School Statistics