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# PetscDTFactorial
Approximate n! as a real number
## Input Parameter
- ***n -*** a non-negative integer
## Output Parameter
- ***factorial -*** n!
## See Also
`PetscDTFactorialInt()`, `PetscDTBinomialInt()`, `PetscDTBinomial()`
## Level
beginner
## Location
include/petscdt.h
## Examples
src/dm/tutorials/ex26.c
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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/include/petscdt.h)
[Index of all DT routines](index.md)
[Table of Contents for all manual pages](/manualpages/index.md)
[Index of all manual pages](/manualpages/singleindex.md)