diff --git a/02-BigCountries.py b/02-BigCountries.py
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+# Problem 2 - Big Countries ( https://leetcode.com/problems/big-countries/ ) 
+import pandas as pd
+
+def big_countries(world: pd.DataFrame) -> pd.DataFrame:
+    df = world[(world['area'] >= 3000000) | (world['population'] >= 25000000)]
+    return df[['name', 'population', 'area']]
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diff --git a/03-RecyclableandLowFatProducts.py b/03-RecyclableandLowFatProducts.py
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+# Problem 3 - Recyclable and Low Fat Products ( https://leetcode.com/problems/recyclable-and-low-fat-products/ )
+import pandas as pd
+
+def find_products(products: pd.DataFrame) -> pd.DataFrame:
+    df = products[(products['low_fats'] == 'Y') & (products['recyclable'] == 'Y')]
+    return df[['product_id']]
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diff --git a/04-CustomersWhoNeverOrder.py b/04-CustomersWhoNeverOrder.py
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+# Problem 4 - Customer Who Never Order ( https://leetcode.com/problems/customers-who-never-order/ )
+import pandas as pd
+
+def find_customers(customers: pd.DataFrame, orders: pd.DataFrame) -> pd.DataFrame:
+    df = customers[~customers['id'].isin(orders['customerId'])]
+    return df[['name']].rename(columns = {'name':'Customers'})
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