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+---
+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
+```