Prisoners and hats puzzle

Logic Level 2

There are 3 person and 5 caps: 2 black caps and 3 white caps. Each person wear one cap. The are standing like below:

Person 3 > Person 2 > Person 1

Person 3 can see Person 2 and Person 1 and can see the color of their caps but doesn't know the color of his own cap.

Person 2 can see Person 1 and can see the color of his cap but doesn't know the color of his own cap.

Person 1 don't even know the color of his own cap.

When asked to Person 3 about the color of his cap, he replied "I don't know".

When asked to Person 2 about the color of his cap, he replied "I don't know".

Now Person 1 is sure about the color of his cap.

What is the color of Person 1's cap and why?

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