Update and rename gauss-sum.md to sumN.md

snippets/gauss-sum.md

@@ -1,17 +0,0 @@
----
-title: gauss-sum
-tags: math,beginner
----
-
-Sums the numbers between 1 up to `limit` argument.
-
-- It is an implementation of the Gauss sum equation.
-
-```js
-const gaussSum = limit =>
-  (limit * (limit + 1)) / 2;
-```
-
-```js
-gaussSum(100); // 1 + 2 + 3 + 4 + ... + 100 = 5050
-```

snippets/sumN.md

@@ -0,0 +1,16 @@
+---
+title: sumN
+tags: math,beginner
+---
+
+Sums all the numbers between 1 and `n`.
+
+- Use the formula `(n * (n + 1)) / 2` to get the sum of all the numbers between 1 and `n`.
+
+```js
+const sumN = n => (n * (n + 1)) / 2;
+```
+
+```js
+sumN(100); // 5050
+```