diff --git a/your-code/main.ipynb b/your-code/main.ipynb
index b8b7a9c..5b495fd 100644
--- a/your-code/main.ipynb
+++ b/your-code/main.ipynb
@@ -24,7 +24,21 @@
    "outputs": [],
    "source": [
     "\"\"\"\n",
-    "your solution here\n",
+    "P(A U B) = P(A) + P(B) - P(A & B)\n",
+    "         = 0.3 + 0.6 - 0.1\n",
+    "         = 0.8\n",
+    "The first staement is false.\n",
+    "\n",
+    "The second statement is true (based on venn diagram.)\n",
+    "\n",
+    "The third statement is False (= 0.3)\n",
+    " - The union of B and Bc is everything. So the P(A & everything) is P(A)\n",
+    " \n",
+    "The fourth statement is false (= 0.2, based on veen diagram).\n",
+    "\n",
+    "The fifth statement is true (1 - P(A & B) = 0.9)\n",
+    "\n",
+    "\n",
     "\"\"\""
    ]
   },
@@ -49,7 +63,27 @@
    "outputs": [],
    "source": [
     "\"\"\"\n",
-    "your solution here\n",
+    "Total balls = 30\n",
+    "\n",
+    "P(white ball) = 10/30 = 1/3\n",
+    "\n",
+    "P(white ball after black)  = 10/29\n",
+    "\n",
+    "P(red ball after black and red) = 11/28\n",
+    "\n",
+    "P(red ball with reposition) = 12/30\n",
+    "\n",
+    "\n",
+    "If we were meant to calculate both probabilities:\n",
+    "\n",
+    "P(white ball) = 10/30 = 1/3\n",
+    "\n",
+    "P(white ball after black) = 8/30 * 10/29\n",
+    "\n",
+    "P(red ball after black and red) = 11/28 * 8/29 * 12/30\n",
+    "\n",
+    "P(red ball with reposition) = 12/30 * 8/30 * 12/30\n",
+    "\n",
     "\"\"\""
    ]
   },
@@ -75,7 +109,17 @@
    "outputs": [],
    "source": [
     "\"\"\"\n",
-    "your solution here\n",
+    "P(C|R) = 0.5\n",
+    "P(R) = 0.1\n",
+    "P(C) = 0.4\n",
+    "\n",
+    "We want to know P(R|C)\n",
+    "\n",
+    "P(C & R) = 0.5 * 0.1 = 0.05\n",
+    "\n",
+    "P(R|C) = P(C & R) / P(C)\n",
+    "       = 0.05/0.4\n",
+    "       = 0.125\n",
     "\"\"\""
    ]
   },
@@ -101,12 +145,12 @@
    ]
   },
   {
-   "cell_type": "code",
-   "execution_count": null,
+   "attachments": {},
+   "cell_type": "markdown",
    "metadata": {},
-   "outputs": [],
    "source": [
-    "# your code here"
+    "480 men     = 324 yes | 156 no\n",
+    "520 women   = 351 yes | 169 no"
    ]
   },
   {
@@ -116,7 +160,7 @@
    "outputs": [],
    "source": [
     "\"\"\"\n",
-    "your solution here\n",
+    "It seems that they care in the same proportion about street lighting independently of their genitals\n",
     "\"\"\""
    ]
   }