diff --git a/study/001_introduction-to-probability-statistics-and-random-processes/ch2/notes.ipynb b/study/001_introduction-to-probability-statistics-and-random-processes/ch2/notes.ipynb
index 47264b4..a7a96c8 100644
--- a/study/001_introduction-to-probability-statistics-and-random-processes/ch2/notes.ipynb
+++ b/study/001_introduction-to-probability-statistics-and-random-processes/ch2/notes.ipynb
@@ -63,12 +63,6 @@
     "\n",
     "- **unordered sampling with replacement:** $\\binom{n + k - 1}{k}$"
    ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "2b937ed3",
-   "metadata": {},
-   "source": []
   }
  ],
  "metadata": {