diff --git a/02_activities/assignments/assignment_2.ipynb b/02_activities/assignments/assignment_2.ipynb
index 26bb3864..87ba8b31 100644
--- a/02_activities/assignments/assignment_2.ipynb
+++ b/02_activities/assignments/assignment_2.ipynb
@@ -27,9 +27,17 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 1,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "3\n"
+     ]
+    }
+   ],
    "source": [
     "import hashlib\n",
     "\n",
@@ -37,7 +45,7 @@
     "     hash_object = hashlib.sha256(input_string.encode())\n",
     "     hash_int = int(hash_object.hexdigest(), 16)\n",
     "     return (hash_int % 3) + 1\n",
-    "input_string = \"your_first_name_here\"\n",
+    "input_string = \"ashwinder\"\n",
     "result = hash_to_range(input_string)\n",
     "print(result)\n"
    ]
@@ -159,7 +167,7 @@
     "\n",
     "  # Question Three: Missing Number in Range\n",
     " \n",
-    "  You are given a list containing `n` integers in the range `[0, n]`. Return a list of numbers that are missing from the range `[0, n]` of the array. If there is no missing number, return -1. Note, all the integers in the list may not be unique.\n",
+    "  You are given a list of non-negative integers. Return a list of numbers that are missing from the range [0, maximum value]. If there is no missing number, return -1. Note, all the integers in the list may not be unique.\n",
     "  \n",
     "  ## Examples\n",
     "\n",
@@ -188,14 +196,51 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 14,
    "metadata": {
     "scrolled": true
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[2, 3, 4]"
+      ]
+     },
+     "execution_count": 14,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
+    "from typing import List\n",
+    "\n",
     "def missing_num(nums: List) -> int:\n",
-    "  # TODO"
+    "  #todo\n",
+    "  if len(nums) == 0:\n",
+    "    return -1\n",
+    "  \n",
+    "  # take the maximum value to create a bool present list\n",
+    "  max_number = max(nums)\n",
+    "  present = [False] * (max_number + 1)\n",
+    "  \n",
+    "  # now set the present list indices true for the values present in nums\n",
+    "  for num in nums:\n",
+    "    if 0 <= num <= max_number:\n",
+    "      present[num] = True\n",
+    "\n",
+    "  # collect the missing numbers\n",
+    "  missing = []\n",
+    "  # to collect missing number\n",
+    "  # check for the range 0 to max\n",
+    "  for i in range(max_number + 1):\n",
+    "    if present[i] != True:\n",
+    "      missing.append(i)\n",
+    "\n",
+    "  return missing\n",
+    "\n",
+    "nums = [5,0,1]\n",
+    "missing_num(nums)"
    ]
   },
   {
@@ -209,6 +254,15 @@
     "You and your partner must share each other's Assignment 1 submission."
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "I got the assignment below:\n",
+    "\n",
+    "https://github.com/VinuShan4/algorithms_and_data_structures/pulls"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -396,7 +450,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "dsi_participant",
    "language": "python",
    "name": "python3"
   },
@@ -410,7 +464,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.11.5"
+   "version": "3.9.23"
   }
  },
  "nbformat": 4,