Factorial Calculator
n! = 1×2×3×...×n
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Ammattilaisen vinkki
Stirling's approximation: n! ≈ √(2πn) × (n/e)ⁿ. For large n, this is very accurate. For n=10: exact = 3,628,800; Stirling gives 3,598,696 (0.83% error).
Tiesitkö?
The number of ways to shuffle a standard 52-card deck is 52! ≈ 8 × 10⁶⁷. This number is so large that every time you shuffle a deck, you are almost certainly creating an ordering that has never existed before in human history.
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Muuttujan selitys
Definition
Product of all positive integers from 1 to n.
Recursive definition
Each factorial is n times the previous.
Stirling's approximation
Accurate estimate for large n.
Read the full guide on how to use this calculator effectively
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