Calculator for the fundamental counting principle
This function calculates the fundamental counting principle or also called "product rule of combinatorics".
To perform the calculation, select the number of operands and enter the numbers to be multiplied. Then click the Calculate button.

In combinatorics, the product rule or the multiplication principle is a counting principle that expresses how many possible combinations there are when a variant x is combined with y and/or z.
If a cabinet or shelf is offered in 3 wood colors. There are two options with or without a drawer and 3 possibilities: without doors, with wooden doors or glass doors.
Then there are \(\displaystyle 3 × 2× 3 =18 \) variants
