Written by the Fiveable Content Team โข Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examโขWritten by the Fiveable Content Team โข Last updated September 2025
Definition
Factorial refers to the product of an integer and all the positive integers below it. For example, the factorial of 5 (written as 5!) is equal to 5 x 4 x 3 x 2 x 1.