Recently, a logical question about family relationships has sparked heated discussions on major social platforms! The title describes the relationship between the passengers on an airplane: there are 3 fathers and sons, 3 mothers and sons, and 3 brothers and sisters. This deceptively simple math problem resulted in 99% of the participants giving the wrong answer!

Common Wrong Answers:

1. Direct addition: 3 3 3 = 9 people (wrong) 2. Consider partial recurrence: 6-7 people (still wrong)3. Ignoring key family relationships (completely detached)

Correct Answer Analysis:

Only a minimum of 5 people is required! Specific Composition:1. Grandfather (as father)2. Father (grandfather's son, also father)3. Mother4. Son 5. daughter

So satisfied:

• 3 fathers and sons: grandfather, father, son

• Mother and 3 children: mother, son, daughter

• 3 siblings: father, son, and daughter

Why is this question so difficult? 1. Breaking the conventional mathematical addition thinking 2.

There is a need to understand the overlapping of multiple family identities3. Test the ability to reason about abstract relationships4. Behind the simple numbers lies a complex relationship

Key Techniques for Problem Solving:1. Diagram of the family tree 2. Finding the possibility of identity duplication3. Considering the principle of least number of people4. Verify that each relationship is satisfied

Netizens are hot: "It's so unusual! I did the math three times before I understood," "I had to consider identity duplication like this," "This kind of thinking training question should come from more points."

Now you can try it too! If you use this logic, if the title is changed to "4 fathers and sons, 4 mothers and sons, and 4 brothers and sisters", how many people are needed?