diff --git a/snippets/sum.md b/snippets/sum.md
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--- a/snippets/sum.md
+++ b/snippets/sum.md
@@ -1,6 +1,6 @@
 ### sum
 
-Returns the sum of an of two or more numbers/arrays.
+Returns the sum of two or more numbers/arrays.
 
 Use `Array.reduce()` to add each value to an accumulator, initialized with a value of `0`.