Factorial Calculator

Calculate factorial (n!) and double factorial (n!!). Useful for permutations, combinations, and mathematical calculations.

Number (n)

Factorial (n!)

120

Double Factorial (n!!)15

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Formula

n! = n × (n-1) × (n-2) × ... × 2 × 1

Calculate probability of single events, combined events (AND/OR), permutations, and combinations.

Advanced scientific calculator with trigonometric functions, logarithms, powers, roots, factorial, and more.

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