HR Round Interview Logical Reasoning Coding Decoding

There are three persons standing one after the other in a row. There are 3 white hats, 2 black hats. Each persons cannot see their own hat as well as the hat behind them. The first person says that his hat is white in colour without the other two saying anything. how is this possible

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why do you use byte code in java In a market 11 men are standing. Their average age before 4 years was 31. One man of age 44 is added to this group. What is the average age of all the men now?