diff --git a/your-code/challenges.ipynb b/your-code/challenges.ipynb
index ba91b3f..27d5aa8 100644
--- a/your-code/challenges.ipynb
+++ b/your-code/challenges.ipynb
@@ -13,11 +13,28 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 30,
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Your code here"
+    "tup = (\"I\",)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 31,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "('I',)\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(tup)"
    ]
   },
   {
@@ -31,11 +48,19 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 33,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "<class 'tuple'>\n"
+     ]
+    }
+   ],
    "source": [
-    "# Your code here"
+    "print(type(tup))"
    ]
   },
   {
@@ -53,16 +78,13 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 4,
    "metadata": {
     "scrolled": true
    },
    "outputs": [],
    "source": [
-    "# Your code here\n",
-    "\n",
-    "# Your explanation here\n",
-    "# You can :) "
+    "# Tuples are immutable, meaning that you cannot add or modify elements."
    ]
   },
   {
@@ -80,11 +102,31 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 5,
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Your code here"
+    "car = (\"I\", \"r\", \"o\", \"n\", \"h\", \"a\", \"c\", \"k\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "('I', 'r', 'o', 'n', 'h', 'a', 'c', 'k')"
+      ]
+     },
+     "execution_count": 6,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "car"
    ]
   },
   {
@@ -102,11 +144,23 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 7,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "I\n",
+      "I\n"
+     ]
+    }
+   ],
    "source": [
-    "# Your code here"
+    "tup1 = tup[:4]    # ('I', 'r', 'o', 'n') - First 4 elements\n",
+    "tup2 = tup[-4:]   # ('h', 'a', 'c', 'k') - Last 4 elements\n",
+    "print(tup1)\n",
+    "print(tup2)"
    ]
   },
   {
@@ -120,11 +174,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 8,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "II\n",
+      "False\n"
+     ]
+    }
+   ],
    "source": [
-    "# Your code here"
+    "tup3 = tup1 + tup2\n",
+    "print(tup3)  # ('I', 'r', 'o', 'n', 'h', 'a', 'c', 'k')\n",
+    "print(tup3 == tup)"
    ]
   },
   {
@@ -136,11 +201,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 9,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "True\n"
+     ]
+    }
+   ],
    "source": [
-    "# Your code here"
+    "count_tup1 = len(tup1)\n",
+    "count_tup2 = len(tup2)  \n",
+    "sum_counts = count_tup1 + count_tup2\n",
+    "print(sum_counts == len(tup3))"
    ]
   },
   {
@@ -152,11 +228,21 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 10,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "4\n"
+     ]
+    }
+   ],
    "source": [
-    "# Your code here"
+    "tup3 = ('I', 'r', 'o', 'n', 'h', 'a', 'c', 'k')\n",
+    "index = tup3.index(\"h\")\n",
+    "print(index)"
    ]
   },
   {
@@ -176,20 +262,26 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "# Your code here"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 11,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "True\n",
+      "False\n",
+      "True\n",
+      "False\n",
+      "False\n"
+     ]
+    }
+   ],
    "source": [
-    "# Your code here"
+    "# Your code here\n",
+    "letters = [\"a\", \"b\", \"c\", \"d\", \"e\"]\n",
+    "for letter in letters:\n",
+    "    print(letter in tup3)"
    ]
   },
   {
@@ -203,11 +295,25 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 12,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "a: 1\n",
+      "b: 0\n",
+      "c: 1\n",
+      "d: 0\n",
+      "e: 0\n"
+     ]
+    }
+   ],
    "source": [
-    "# Your code here"
+    "# Your code here\n",
+    "for letter in letters:\n",
+    "    print(f\"{letter}: {tup3.count(letter)}\")"
    ]
   },
   {
@@ -223,7 +329,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 13,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -248,11 +354,12 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 14,
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Your code here"
+    "# Your code here\n",
+    "sample_list_1 = random.sample(range(0, 101), 80)"
    ]
   },
   {
@@ -264,11 +371,21 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 15,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "80\n"
+     ]
+    }
+   ],
    "source": [
-    "# your code here"
+    "# your code here\n",
+    "set1 = set(sample_list_1)\n",
+    "print(len(set1))"
    ]
   },
   {
@@ -287,11 +404,12 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 16,
    "metadata": {},
    "outputs": [],
    "source": [
-    "# your code here"
+    "# your code here\n",
+    "sample_list_2 = [random.randint(0, 100) for _ in range(80)]"
    ]
   },
   {
@@ -303,11 +421,21 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 17,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "54\n"
+     ]
+    }
+   ],
    "source": [
-    "# Your code here"
+    "# Your code here\n",
+    "set2 = set(sample_list_2)\n",
+    "print(len(set2))"
    ]
   },
   {
@@ -319,11 +447,12 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 18,
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Your code here"
+    "# Your code here\n",
+    "set3 = set1 - set2"
    ]
   },
   {
@@ -335,11 +464,12 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 19,
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Your code here"
+    "# Your code here\n",
+    "set4 = set2 - set1"
    ]
   },
   {
@@ -351,11 +481,12 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 20,
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Your code here"
+    "# Your code here\n",
+    "set5 = set1 & set2"
    ]
   },
   {
@@ -375,11 +506,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 21,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "True\n",
+      "True\n"
+     ]
+    }
+   ],
    "source": [
-    "# Your code here"
+    "# Your code here\n",
+    "print(len(set1) == len(set3) + len(set5))\n",
+    "print(len(set2) == len(set4) + len(set5))"
    ]
   },
   {
@@ -391,11 +533,12 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 22,
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Your code here"
+    "# Your code here\n",
+    "set6 = set()"
    ]
   },
   {
@@ -407,11 +550,13 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 23,
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Your code here"
+    "# Your code here\n",
+    "set6 = set()\n",
+    "set6.update(set3, set5)"
    ]
   },
   {
@@ -423,11 +568,20 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 24,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "True\n"
+     ]
+    }
+   ],
    "source": [
-    "# Your code here"
+    "# Your code here\n",
+    "print(set1 == set6)  # True (set6 contains all elements of set1)"
    ]
   },
   {
@@ -439,11 +593,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 25,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "False\n",
+      "True\n"
+     ]
+    }
+   ],
    "source": [
-    "# Your code here"
+    "# Your code here\n",
+    "print(set2.issubset(set1))  # False\n",
+    "print(set3.issubset(set1))  # True"
    ]
   },
   {
@@ -457,11 +622,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 26,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "True\n"
+     ]
+    }
+   ],
    "source": [
-    "# Your code here"
+    "# Your code here\n",
+    "union1 = set3 | set4 | set5\n",
+    "union2 = set1 | set2\n",
+    "print(union1 == union2)"
    ]
   },
   {
@@ -473,11 +649,12 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 27,
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Your code here"
+    "# Your code here\n",
+    "first_element = set1.pop()"
    ]
   },
   {
@@ -493,11 +670,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 28,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "{4, 5, 6, 8, 12, 13, 15, 16, 17, 18, 20, 22, 23, 24, 25, 27, 28, 30, 32, 34, 35, 36, 37, 40, 42, 43, 44, 45, 48, 50, 52, 53, 54, 56, 57, 58, 60, 62, 63, 64, 66, 67, 68, 70, 73, 74, 75, 76, 78, 80, 82, 83, 84, 85, 86, 88, 90, 92, 93, 94, 95, 96, 97, 98}\n"
+     ]
+    }
+   ],
    "source": [
-    "# Your code here"
+    "# Your code here\n",
+    "list_to_remove = [1, 9, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69, 71, 79, 81, 89, 91, 99]\n",
+    "set1.difference_update(set(list_to_remove))\n",
+    "print(set1)"
    ]
   },
   {
@@ -515,7 +703,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 29,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -602,7 +790,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "base",
    "language": "python",
    "name": "python3"
   },
@@ -616,12 +804,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
-  },
-  "vscode": {
-   "interpreter": {
-    "hash": "aee8b7b246df8f9039afb4144a1f6fd8d2ca17a180786b69acc140d282b71a49"
-   }
+   "version": "3.13.5"
   }
  },
  "nbformat": 4,