update functions' exercises

docs/python/python_fundamentals_1/functions.ipynb

@@ -1184,11 +1184,7 @@
     "1. Write a function called is_prime, which checks if a number is prime.\n",
     "1. Write a functions which checks if all items are unique in the list.\n",
     "1. Write a function which checks if all the items of the list are of the same data type.\n",
-    "1. Write a function which check if provided variable is a valid python variable\n",
-    "1. Go to the data folder and access the countries-data.py file.\n",
-    "\n",
-    "    - Create a function called the most_spoken_languages in the world. It should return 10 or 20 most spoken languages in the world in descending order\n",
-    "    - Create a function called the most_populated_countries. It should return 10 or 20 most populated countries in descending order."
+    "1. Write a function which check if provided variable is a valid python variable"
    ]
   }
  ],