From ab8962de5385e1430f4d9f649b0afe4b5e93051e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=9D=A8=E7=83=A8?= <imissyou5201314@outlook.com>
Date: Mon, 13 Dec 2021 13:20:38 +0800
Subject: [PATCH] =?UTF-8?q?=E6=97=B6=E9=97=B4=E5=A4=8D=E6=9D=82=E5=BA=A6?=
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---
 数据结构/时间复杂度/常用数列前n项和.md | 8 ++++++++
 1 file changed, 8 insertions(+)
 create mode 100644 数据结构/时间复杂度/常用数列前n项和.md

diff --git a/数据结构/时间复杂度/常用数列前n项和.md b/数据结构/时间复杂度/常用数列前n项和.md
new file mode 100644
index 0000000..6399a6f
--- /dev/null
+++ b/数据结构/时间复杂度/常用数列前n项和.md
@@ -0,0 +1,8 @@
+# 求解中常用数列的前n项和
+
+### 1. n<sup>2</sup>
+
+$$
+n(n+1)(2n+1)/6
+$$
+