Three Tribes

Here is one of my favorite puzzles from the past ten years or so of the Puzzle column for Technology Review (edited by Allan Gottlieb).

You're on an island with natives from three different tribes. One tribe always tells the truth, one always lies, and one always gives random answers. You get to ask three yes-or-no questions, each one directed to the native of your choice. Then you have to identify which native is which. How do you do it?

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