Question 1

What is 0 factorial?

Accepted Answer

0\! = 1 by definition. This makes combinatorics formulas work correctly. 1\! = 1 as well.

Question 2

Where are factorials used?

Accepted Answer

Permutations (n\!), combinations (n\!/r\!(n-r)\!), probability, Taylor series, and counting arrangements.

Question 3

How accurate are these calculations?

Accepted Answer

Our calculator uses double-precision floating-point arithmetic, accurate to about 15-16 significant digits for most calculations.

Question 4

Can I use the result in further calculations?

Accepted Answer

Yes, results are calculated to full precision. You can copy the exact value or use the rounded display depending on your needs.

Factorial Calculator Nc Calculator - Free Online Tool

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