diff --git a/your-code/main.ipynb b/your-code/main.ipynb
index b8b7a9c..f3c3ea8 100644
--- a/your-code/main.ipynb
+++ b/your-code/main.ipynb
@@ -23,9 +23,8 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "\"\"\"\n",
-    "your solution here\n",
-    "\"\"\""
+    "# 𝑃(𝐴∪𝐵)=0.6\n",
+    "# 𝑃(𝐴𝐶∩𝐵𝐶)=0.3"
    ]
   },
   {
@@ -44,13 +43,38 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 6,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Probability of a white ball out: 0.3333333333333333\n",
+      "Probability of taking a white ball after taking a black ball: 0.09195402298850575\n",
+      "Probability of taking a red ball after taking a black and a red ball: 0.04334975369458128\n",
+      "Probability of taking a red ball after taking a black and a red ball put it back: 0.04266666666666667\n"
+     ]
+    }
+   ],
    "source": [
-    "\"\"\"\n",
-    "your solution here\n",
-    "\"\"\""
+    "total_white = 10\n",
+    "total_black = 8\n",
+    "total_red = 12\n",
+    "total_balls = total_white + total_black + total_red\n",
+    "\n",
+    "prob_white = total_white / total_balls\n",
+    "\n",
+    "prob_white_after_black = (total_white / (total_balls - 1)) * (total_black / total_balls)\n",
+    "\n",
+    "prob_red_after_black_and_red = (total_red / (total_balls - 2)) * (total_black / (total_balls - 1)) * (total_red - 1) / total_balls\n",
+    "\n",
+    "prob_red_after_black_and_red_put_back = (total_red / total_balls) * (total_black / total_balls) * (total_red / total_balls)\n",
+    "\n",
+    "print(\"Probability of a white ball out:\", prob_white)\n",
+    "print(\"Probability of taking a white ball after taking a black ball:\", prob_white_after_black)\n",
+    "print(\"Probability of taking a red ball after taking a black and a red ball:\", prob_red_after_black_and_red)\n",
+    "print(\"Probability of taking a red ball after taking a black and a red ball put it back:\", prob_red_after_black_and_red_put_back)"
    ]
   },
   {
@@ -70,13 +94,25 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 4,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Probability of rain given that the day started cloudy: 0.125\n"
+     ]
+    }
+   ],
    "source": [
-    "\"\"\"\n",
-    "your solution here\n",
-    "\"\"\""
+    "p_rain = 0.10 \n",
+    "p_cloudy_if_rain = 0.50 \n",
+    "p_cloudy = 0.40 \n",
+    "\n",
+    "p_rain_given_cloudy = (p_cloudy_if_rain * p_rain) / p_cloudy\n",
+    "\n",
+    "print(\"Probability of rain given that the day started cloudy:\", p_rain_given_cloudy)"
    ]
   },
   {
@@ -102,11 +138,33 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 1,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "        Yes   No  Total\n",
+      "Gender                 \n",
+      "Men     324  156    480\n",
+      "Women   351  169    520\n",
+      "Total   675  325   1000\n"
+     ]
+    }
+   ],
    "source": [
-    "# your code here"
+    "answers = {\n",
+    "    'Gender': ['Men', 'Women', 'Total'],\n",
+    "    'Yes': [324, 351, 675],\n",
+    "    'No': [156, 169, 325],\n",
+    "    'Total': [480, 520, 1000]\n",
+    "}\n",
+    "\n",
+    "contingency_table = pd.DataFrame(answers)\n",
+    "contingency_table = contingency_table.set_index('Gender')\n",
+    "\n",
+    "print(contingency_table)"
    ]
   },
   {
@@ -115,15 +173,13 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "\"\"\"\n",
-    "your solution here\n",
-    "\"\"\""
+    "# The probability of wanting more street lighting does not depend on whether the respondent is male or female."
    ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -137,7 +193,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.2"
+   "version": "3.10.9"
   }
  },
  "nbformat": 4,