Fix grammar (GH-13801)
diff --git a/Doc/library/math.rst b/Doc/library/math.rst
index 4a15789..28ed5d21 100644
--- a/Doc/library/math.rst
+++ b/Doc/library/math.rst
@@ -48,7 +48,7 @@
to the coefficient of k-th term in polynomial expansion of the
expression ``(1 + x) ** n``.
- Raises :exc:`TypeError` if either of the arguments not integers.
+ Raises :exc:`TypeError` if either of the arguments are not integers.
Raises :exc:`ValueError` if either of the arguments are negative.
.. versionadded:: 3.8
@@ -218,7 +218,7 @@
Evaluates to ``n! / (n - k)!`` when ``k <= n`` and evaluates
to zero when ``k > n``.
- Raises :exc:`TypeError` if either of the arguments not integers.
+ Raises :exc:`TypeError` if either of the arguments are not integers.
Raises :exc:`ValueError` if either of the arguments are negative.
.. versionadded:: 3.8