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Factorial

usgb/fækˈtɔːriəl/Volume
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Math SpecificPlay
Used mostly in math, particularly in probability and combinatorics. SlideTo solve this problem, you'll need to find the factorial of 7.
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Symbol RepresentationPlay
The exclamation mark (!) denotes factorial, like in 5! for 5 factorial. SlideCan you calculate 8! for me?
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Non-Negative IntegersPlay
Factorials are only defined for non-negative integers, and 0! is 1. SlideRemember that the factorial of a negative number doesn't exist.