So, in Mathematics we use more precise language: When the order doesn't matter, it is a Combination. When the order does matter it is a Permutation.

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

What is a Formula? A formula is a fact or rule that uses mathematical symbols. It will usually have: an equals sign (=) two or more variables (x, y, etc) that stand in for values we don't know yet; It shows us how things are related to each other.

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Enter formulas such as (3+2/9)^2 or sin(1/5), has history and even a slider for an "a" value. Scientific Calculator Accepts formulas such as (3+2/9)^2 or sin(1/5) and you can also click on a keypad.

In fact there is a formula from Combinations for working out the value at any place in Pascal's triangle: It is commonly called "n choose k" and written like this: n! k!(n−k)! = ( n k )

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

The answer is a combination of a Real and an Imaginary Number, which together is called a Complex Number. We can plot such a number on the complex plane (the real numbers go left-right, and the imaginary numbers go up-down):

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

Illustrated definition of Linear Combination: Where we multiply each term by a constant then add them up. Example: ax by is a linear combination...