Last Puzzles (Tricky Logic Brain Teaser)

Alan is an honest person who never speaks a lie. He thinks of a number among 1, 2 and 3. Now, you can ask him only one question and that too for which the answer that you will receive will be in the form of yes, no or don't know. But he will reply only truth fully. What will you ask from his so that you can know the number he is thinking of?

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