Factorial Calculator
Calculate factorials (n!) for any positive integer with step-by-step calculations and mathematical applications
Factorial Properties
• n! = n × (n-1) × (n-2) × ... × 2 × 1
• 0! = 1 by definition
• n!! = n × (n-2) × (n-4) × ...
• Used in permutations, combinations, probability
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