what is the difference between "how about you ?"and "what about you?"?

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Answer

"how about you?" is a little bit more formal

If I were talking to a teacher or a boss I would ask "how about you?"

When talking to friends or family I would use either "how about you?" or "what about you?"

The meaning is the same though.

Answer

they are the same

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They're pretty much interchangeable.

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You can use how about you into your friends when you wanna know about he/she opinion ..