आप कैसे हैं? (aap kaise hain?)
Here's a breakdown:
* आप (aap): You (formal/plural)
* कैसे (kaise): How
* हैं (hain): Are (present tense)
Other options depending on context:
* आप कैसे हैं? (aap kaise hain?) (Formal, polite, for someone you don't know well)
* तुम कैसे हो? (tum kaise ho?) (Informal, for someone you know well)
* क्या हाल है? (kya haal hai?) (Informal, meaning "How are things?")
* कैसे चल रहा है? (kaise chal raha hai?) (Informal, meaning "How's it going?")
Remember: The best way to choose the right phrase depends on your relationship with the person you're speaking to and the overall context of the conversation.