Fermat_little_theorem type annotation (#9794)

* Replacing the generator with numpy vector operations from lu_decomposition.

* Revert "Replacing the generator with numpy vector operations from lu_decomposition."

This reverts commit ad217c6.

* Added type annotation.

* Update fermat_little_theorem.py

Used other syntax.

* Update fermat_little_theorem.py

* Update maths/fermat_little_theorem.py

---------

Co-authored-by: Tianyi Zheng <tianyizheng02@gmail.com>

Author: quant12345

maths/fermat_little_theorem.py

@@ -5,7 +5,7 @@
 # Wikipedia reference: https://en.wikipedia.org/wiki/Fermat%27s_little_theorem
 
 
-def binary_exponentiation(a, n, mod):
+def binary_exponentiation(a: int, n: float, mod: int) -> int:
     if n == 0:
         return 1