diff --git a/Extra_questions/.ipynb_checkpoints/04_Lists-checkpoint.ipynb b/Extra_questions/.ipynb_checkpoints/04_Lists-checkpoint.ipynb
index 5349ab1..997c204 100644
--- a/Extra_questions/.ipynb_checkpoints/04_Lists-checkpoint.ipynb
+++ b/Extra_questions/.ipynb_checkpoints/04_Lists-checkpoint.ipynb
@@ -150,6 +150,34 @@
     "```"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "- Write a program to find the least positive integer missing from a list of input integers.\n",
+    "\n",
+    "    **Example :** \n",
+    "\n",
+    "```Python\n",
+    "\n",
+    "def least_positive_integer(input_list):\n",
+    "    # your code here\n",
+    "\n",
+    "\n",
+    "\n",
+    "List_1 = [1,-2,3,0,7,8,5,2,-6]\n",
+    "\n",
+    "least_positive_integer(List_1)\n",
+    ">>> 4\n",
+    "    \n",
+    "List_2 = [3,7,-1,8,9,10]\n",
+    "\n",
+    "least_positive_integer(List_2)\n",
+    ">>> 1\n",
+    "    \n",
+    "```"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -231,7 +259,7 @@
    "provenance": []
   },
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -245,7 +273,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.6"
+   "version": "3.8.10"
   }
  },
  "nbformat": 4,
diff --git a/Extra_questions/04_Lists.ipynb b/Extra_questions/04_Lists.ipynb
index 5349ab1..997c204 100644
--- a/Extra_questions/04_Lists.ipynb
+++ b/Extra_questions/04_Lists.ipynb
@@ -150,6 +150,34 @@
     "```"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "- Write a program to find the least positive integer missing from a list of input integers.\n",
+    "\n",
+    "    **Example :** \n",
+    "\n",
+    "```Python\n",
+    "\n",
+    "def least_positive_integer(input_list):\n",
+    "    # your code here\n",
+    "\n",
+    "\n",
+    "\n",
+    "List_1 = [1,-2,3,0,7,8,5,2,-6]\n",
+    "\n",
+    "least_positive_integer(List_1)\n",
+    ">>> 4\n",
+    "    \n",
+    "List_2 = [3,7,-1,8,9,10]\n",
+    "\n",
+    "least_positive_integer(List_2)\n",
+    ">>> 1\n",
+    "    \n",
+    "```"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -231,7 +259,7 @@
    "provenance": []
   },
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -245,7 +273,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.6"
+   "version": "3.8.10"
   }
  },
  "nbformat": 4,