# Rule of Product Calculator

Calculator for the fundamental counting principle

## Rule of Product Calculation

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.

Rule of Product Calculator

 Input Numbers of Values 1 2 3 4 5 6 7 8 9 10 Number a1 Number a2 Number a3 Number a4 Number a5 Number a6 Number a7 Number a8 Number a9 Number a10 Decimal places 0 1 2 3 4 6 8 10 Result

## Description of the fundamental counting principle

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.

#### Example

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

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