[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

maths/combinations.py

@@ -1,6 +1,8 @@
 """
 https://en.wikipedia.org/wiki/Combination
 """
+
+
 def combinations(n: int, k: int) -> int:
     """
     Returns the number of different combinations of k length which can
@@ -38,6 +40,7 @@ def combinations(n: int, k: int) -> int:
         res = res // (i + 1)
     return res
 
+
 if __name__ == "__main__":
     print(
         "The number of five-card hands possible from a standard",