COMBIN Google Sheet Formula

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COMBIN Formula Syntax

=COMBIN(5, 2)

Example Use Case

Calculating the number of combinations for selecting items without regard to order

Understanding the COMBIN Formula

The COMBIN function in Excel calculates the number of ways to choose a set number of items from a larger group, ignoring order. It’s rooted in combinatorics, perfect for probability, team selection, or lottery odds. It takes two arguments: the total items (n) and the number to choose (k).

Say you’re picking 2 people from a group of 5: COMBIN tells you there are 10 possible pairs. It uses the formula n!/(k!(n-k)!), but Excel handles the math, saving you time. It’s all about combinations, not permutations—order doesn’t matter here.

Why Use COMBIN?

COMBIN is a shortcut for counting possibilities in unordered selections. It’s used in statistics, project planning, or gaming scenarios where you need quick, accurate counts without listing every option. Its simplicity makes it a staple for combinatorial tasks.